CaeMarch

CaeMarch is the het ship between Caelus and March 7th from the Honkai: Star Rail fandom.

Canon
The Astral Express Crew is made up of March and Caelus; Caelus is the most recent member of the crew. Following his second awakening (the first occurred when Kafka and Silver Wolf were erased from his memory), Caelus meets March, who is the second person he encounters after Dan Heng. After the Herta Space Station was attacked by the Antimatter Legion, the two travel to the master control zone of the station with Dan Heng.

When March is the target of an attack launched by the Doomsday Beast of the Antimatter Legion early in the story, Caelus leaps in the way of the blast and shields her. This shows how quickly they bonded. March rushes to catch Caelus when he faints as a result of the Stellaron in his body losing control after he protected her and expressing concern.

After recovering from feinting on the space station either Dan Heng or March 7th will check in on the Trailblazer and give them their contact information. While there is some debate if the character that appears is gender specific or dialogue choice dependent, the general understanding is that if the player chose Caelus, March 7th will be the one to appear in this scene.

Because of the Astral Express Crew's familiarity with Stellaron, their navigator, Himeko, suggests that Caelus travel as a passenger on the Express. Shortly after boarding the Astral Express, March 7th notices Caelus reaching out at the lights, she shares with him that she had a similar experience when she awoke from being frozen in ice. This scene establishes that both March 7th and Caelus share a loss of memory of their past as well as March 7th's willingness to confide in Caelus.

After arriving at Jarilo-VI, the three Astral Express members were taken to the Underworld where they fought Bronya Rand before Sampo Koski intervened to save them. Caelus and March are searching for him in the Underworld in an effort to find him. They engaged in a game of hide-and-seek with the Moles, a group of friends who describe themselves as "an adventure squad" in the Underworld. After their battle with Cocolia during the Jarilo-VI story, Caelus has the option to tease March 7th about having saved her a second time.

During the story line on the Xianzhou Luofu, Caelus and March are accompanied by Welt Yang but often work together as a pair independent of Welt such as during the companion mission "Frosty Blade's Trial". During this time Caelus and March 7th become more reliant and cooperative with one another. Their dynamic becomes more familiar and March 7th begins to confide her concerns in Caelus more often such as being nervous to take the lead when investigating Loucha during the companion mission "A Knight Stranger". Caelus can be seen shielding March 7th during the story transition to the battle with the Ebon Deer.

Dan Heng was present when Welt said to him in "Oblation Obtained, Order Ordained," from Trailblaze Missions, which those two haven't exactly been on their best behavior during the Luofu mission, which he would've been good to have Dan Heng being there with them. In a conversation with Dan Heng, March 7th will cite Caelus as well as Welt as a reason not to be concerned for her safety.

During the "Aurum Alley's Hustle and Bustle" event Caelus interacts with a character named Boss Du who will have Caelus try his tea. The tea causes Caelus to enter a relaxed state and he has either a day dream or hallucination of March 7th and himself playfully tossing clouds at one another. In another interaction with Boss Du, he will ask Caelus to share a secret with him, Caelus can share how March 7th falls down when the Astral Express warp jumps, and Boss Du will remark that he can see "a romantic customer such as you (Caelus) getting acquainted with a girl who tends to fall down for no reason."

For March 7th's companion mission "Total Recall", March 7th will ask Caelus to accompany her to meet with Fu Xuan from the Divination Commission in hopes that they can use the Matrix of Prescience to learn about March 7th's past. While preparing to enter her memories March 7th is anxious about doing so and will ask if Caelus can enter with her. One of the four memories explored during "Total Recall" is the first time she met Caelus. The final memory distortion The Messenger uses to attempt to dissuade March 7th from trying to investigate her past is a distortion of her memory of Caelus. March 7th discerns that the memory of Caelus is a distortion by expressing that he would never try to keep her from something important to her.

After the conclusion of "Total Recall", March 7th will invite Caelus to her room the next time the player arrives on the Astral Express. She will then share the "March 7th's 'Origin'" light cone with Caelus and the player will receive the light cone in their inventory as a key item. If the player interacts with March 7th while she is still in the room after this dialogue she will ask Caelus if he thinks the "her" in the light cone is cute and the player can choose to have Caelus tell her that the real March 7th is cuter.

During the Trailblaze Continuance mission "Future Market", March 7th and Caelus return to Belobog on their own for the Solwarm festival. When Caelus meets with March 7th in her room as they prepare to depart, March 7th is wearing a new dress and asks Caelus what he thinks of it. Players have the option to have Caelus compliment her dress and Caelus is shown becoming embarrassed when March 7th teases him for not having anything different to wear.

On the way to Belobog for the Solwarm festival, March 7th and Caelus meet Topaz. During their conversation with Topaz she remarks on their teasing that the two of them "make a cute pair". Upon arriving in Belobog for the Solwarm festival the player follows Caelus and March as they enjoy the festival together. Caelus has a single instance of voiced dialogue during the Future Market missions. At the conclusion of the missions he expresses regret that March 7th didn't get to enjoy the Solwarm festival after looking forward to it for ages.

During the "Aetherium Wars" event Caelus and March 7th work together as a pair to become the champions of the Aetherium Wars tournament. Along the event's story they obtain a warp trotter companion that they bond with together. The event shows Caelus and March 7th acting much closer and more cooperative and in the final cutscene of the event Asta can remark that Caelus and March 7th "are really starting to click".

Asta offers to let Caelus and March 7th keep the trotter that they had bonded with throughout the event's story despite the trotter belonging to her. Previously in the story it was shown that March 7th was torn between returning the trotter to it's owner and wanting to keep it due to how close she had grown to it. She asks Caelus to make the decision instead and the player is given the option for Caelus to ask March 7th if she trusts him. If the player picks this option March 7th will confess that she does trust Caelus with "...Yeah. So what?".

Quotes
"Just a suggestion though - you're safe as long as you stick with me ~!"

- March 7th, "Eye of the Storm"

"Awesome! We get to work together as a team again, Caelus!"

- March 7th, "Drifting Between the Stars"

"You're not Caelus. You're nothing like him."

- March 7th, "Total Recall"

"Caelus would never try and force me to give up something so important to me."

- March 7th, "Total Recall"

Promo Appearances
In the official release trailer "Interstellar Journey", March 7th is depicted gazing up at Caelus.

Fanon
Although Caemarch is generally understood to be very canon and has many fans as well as a dedicated fan base, fan content of the two as a romantic pair is rare.

There are 31 works in AO3 with the Caelus/March 7th tag as of the end of August 2023.

Fandom

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