Ranposano

"There is only one such place in this world. A place that doesn't need you at all. Join the Detective Agency. We don't want your ability. What we want is that "kindness". You didn't wish for anyone's death, right? That's why you're suffering so much. We want to invite you because of that "kindness" of yours. To lose that ability would be alright. There's worth to this suffering."

- Ranpo comforting and inviting Yosano to the Detective Agency when they first met.

Ranposano is the het ship between Ranpo Edogawa and Akiko Yosano from the Bungou Stray Dogs fandom.

Canon
Ranpo and Yosano work alongside each other in the Armed Detective Agency. They're shown to be close as Ranpo anticipates Yosano's quirks and hobbies, the two often playing hanafuda and sharing friendly rapport. The two are often paired up on missions and share a close bond.

Yosano places great trust in Ranpo's abilities and shows gratitude for his unwavering kindness when they first met. She greatly appreciates how Ranpo was the one who invited Yosano to the agency and the one who broke her out of her trance-like depressive stupor. It's shown Ranpo truly cares for Yosano, seeing as he was affected greatly by Yosano's 'death' in Poe's book even while knowing it wasn't real. He solved said case without his 'ability' for the first time.

Yosano's past (revealed in the Hunting Dogs Arc)
Fourteen years ago, near the end of the Great War, the 11-year-old Yosano served as a military hospital scholar alongside Mori, erstwhile a military physician for the National Defense Force, and utilized her ability to heal soldiers from the half-death. Over and over as they went insane from being trapped in the battlefield, once the soldier who gifted Yosano her gold adornment committed suicide and denounced her, she was kept isolated in a facility after she attempted to bomb and sink the ship. Four years later when Fukuzawa got the 14-year-old Yosano out, Ranpo and Yosano met.

Fukuzawa and Mori were fighting over the custody of Yosano, and during that Ranpo was spending his time with Yosano escaping with her. Yosano was completely broken back then. Ranpo escorted Yosano on a wheelchair as she remained dull and emotionless. Yosano breaks the silence and asks Ranpo to take her back to Mori, explaining how she can't go on living. However, Ranpo interrupts her saying it's stupid as Yosano jumps, startled and showing slight emotion. Yosano felt like it was her fault the lives of others around her were regarded as nothing but cheap. However, Ranpo explains that if she hates her ability to much she simply shouldn't use it. Comforting her with explaining how his Ultra-Deduction is the world's greatest, and how there'd be no need for Yosano's ability to be called on. Yosano didn't believe him. He proves his Ultra-Deduction by giving her the gold butterfly hairclip which the soldier gave Yosano as a gift, deducing that it meant a lot to her. That was the first time after years where Yosano’s numb face was broken. She asked Ranpo how he know about the butterfly hairclip when she never told anyone about it. He happily said that he could see through everything, and she could pose any kind of question. So Yosano asked him what she could do from now on, shaken as she explains it was her fault someone close to her had died. Yosano asked Ranpo if there's a place where it's okay for her to go on living. Ranpo said he has already told her. He tells Yosano that there's only one place that doesn't require her ability or care for it at all - The Detective Agency. That they don't want her ability, and what they want "is that kindness". He tells her she didn't want anyone to die by her hands, and that kindness is what mattered. After Yosano heard Ranpo's words, she couldn't hold back the tears and at that moment, she was freed from the suffering and despair she endured. He was the first person who told her that it's her feelings that matter, not her ability unlike Mori or the soldiers.

When Yosano is telling Kenji and Jun'ichiro of her past in the Hunting Docs Arc, she remembers her conversation with Ranpo and smiles before she's knocked out of her trance by Jun'ichiro. We see here how much Ranpo affected her and showed her the light in inviting the her to Detective Agency.

Port Mafia Arc
In Chapter 7, Yosano and Ranpo seem to know each other well, with Ranpo correctly anticipating Yosano's quirks and hobbies like asking someone in the Agency to accompany her shopping. Ranpo says that that ability to notice dangerous is a good one, "For example, 10 seconds from now...", just as Ranpo trails off, Yosano walks into the room with a yawn, asking if Atsushi is hurt, then asks if Atsushi would help her with shopping since he's the only one here, Atsushi turns around, confused when he sees everyone is gone, recalling them talking about the ability to sense danger.

In Chapter 21, on casual occasions and even during the Guild war, Ranpo invited Yosano to play a game with him, particularly hanafuda, while Yosano accepted and fiercely asked what their wagers shall be.

The Guild Arc
Yosano accompanies Ranpo to confront the one behind the "invitation to a deduction game", commenting it's most likely a trap. They reach the room, meeting Edgar Allan Poe. She continues to deduce that this is a trap even after Ranpo agrees to it, but Poe invites her to participate as well. Yosano proceeds to read the mystery with Ranpo, sucked into the book's world by Poe's ability, appearing in a different room from Ranpo, and in a traditional doctor's uniform. She finds him with the body, rushing to save the victim, who's alive enough to point out a door in the room.

In the aftermath, Yosano realizes that her ability doesn't work in Poe's book. Ranpo insisted that he has an ability and that abilities could not be used in the book world so he can't solve the case. Later on, Ranpo confirms it as an 'impossible crime'. Noticing Ranpo's poor demeanor despite knowing the ins and outs of the crime, questioning why he doesn't use Super Deduction to solve the mystery. Ranpo points out he doesn't have his glasses, required to "activate" his ability, which wouldn't work anyway given that Yosano can't use hers either. Aware Ranpo has no ability, Yosano plays along, suggesting they solve the crime through normal means. Unfortunately, this greatly displeases Ranpo, who detests the tedium behind normal investigative methods. They decide to ask other people in the room. The guests begin to theorize and argue, thinning out Ranpo's patience. He snaps and corrects them on the case's true details and reaches his own conclusion, and Yosano praises him but conflicted, Ranpo storms off.

Yosano follows him, pointing out Ranpo already knows his skills aren't an ability. In denial, he questions if Fukuzawa lied to him. Knowing how much Fukuzawa means to Ranpo, Yosano doesn't push him. She leaves him be, returning to her room, locking it, using an ax for protection, knowing the serial murders will continue. Although seemingly prepared, Yosano overheard a strange noise, attacked by an unseen assailant.

The guests and Ranpo crowd in her room, finding Yosano with the ax in her abdomen. Ranpo shows immense shock and horror, using his left hand to hold Yosano's shoulder and using his right hand to hold her left. When she was about to die, she placed her trust in the great detective for whom the Agency was established, saying that the ADA was found so Ranpo could make good use of his talent which made him look straight at her with his eyes wide open. In the last moments, Yosano thanked Ranpo for recruiting her to the organization, told him she was still "very grateful" even to that day. As Yosano "died", Ranpo froze, then gnashed his teeth, took her glasses, wore them himself and solved the case, bringing the two out alive out of the book with an unharmed with Yosano. Ranpo finds out it is the first time he solved the case without relying on his glasses and "ability".

After that, as Ranpo and Yosano are walking back, Yosano mentions that Ranpo doesn't actually have an ability. Ranpo declines and insists he has an ability, telling her not to call him normal. He was embarrassed that he would look stupid if he turned out to be normal now, after all the time thinking he was gifted. That makes Yosano laugh as Ranpo tells her not to. She said, "Fine, fine" and he complained, "No 'Fine, fine' either" In this scene we see their bond and friendly banter.

Official BSD Anthology
In Anthology 5 Chapter 10, Ranpo and Atsushi enter the room and see Yosano who is trying her new clothes and Naomi with Kyouka who help her with it. Atsushi asks what they are doing while Ranpo is not very interested in it and just asks about pastries. Then, he asks If they are playing dress up with Yosano-san. Naomi denies it and explains that they went shopping and found so many clothes so Yosano had just to try it. Kyouka shows Ranpo and Atsushi the photos of Yosano in her new styles.

Later, Naomi tries to take her hair clip but Yosano reacts to that very fast. She go off from her touching her hair clip. Yosano apologizes for it and afterwards, Naomi together with Kyouka and Atsushi go to develop the photos and leave Yosano together with Ranpo.

Yosano tells that it seems like those three are having a good time and asks Ranpo does he see it. However, without giving an answer to her question, Ranpo tells Yosano that her current clothing suit her the best. Yosano is surprised. Ranpo adds:

"If it's a hair ornament you're going to wear all the time, you can decise what to wear accordingly."

- Ranpo to Yosano Ranpo asks if her hair clip is really important to her as he noticed. Yosano fell silent for a short time but later tells him that it is best to leave her usual style of clothing as he advised.

Fanon
Ranposano is one of the most popular hetero ships in the Bungou Stray Dogs fandom. However, there are people who see them as a good example of friendship or found family. Despite of this, story about Yosano's past changed opinion of some people who prefered it as friendship and started see them in romantic way. Its biggest rival ship is Ranpoe.

Many shippers believe Ranpo would have a healthier relationship with Yosano over Poe, as they've known each other for 12 years and care for each other greatly (while Ranpo does not reciprocate Poe's affection with the latter attempting to kill Ranpo multiple times.)

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Trivia

 * Ranpo and Yosano are quite often seen standing or sitting next to each other in the Detective Agency.
 * Ranpo is a year older than Yosano. Ranpo is 26 and Yosano is 25.
 * They often stand beside and stare at each other in official artworks.
 * Vol 3-Extra reveal that everyone in ADA buy a part of Atsushi's work outfit because he and Dazai don't have any money. Ranpo buy gloves, while Yosano is the only one in ADA who wear gloves. Yosano buy a tie, while Ranpo and Yosano are the only ones in ADA wear tie.
 * They combine and appear a lot in each others' Active Skill in the official game Tales of The Lost.