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Throughout the game, Tsumugi seems to have a soft spot for Gonta and often appears to pay attention to him during some moments when the others do not. She is quite impressed and concerned about how blunt and honest Gonta is.
During Chapter 3, the two and Shuichi Saihara investigate the new floor together. As Gonta offers to help, Tsumugi expresses that he is a gentleman who could use 'a tuxedo and a mask,' a reference to the Sailor Moon character, Tuxedo Mask. However, she later revokes this statement, saying that he is not ready to wear a tuxedo and a mask just yet.
During Chapter 4's trial, she appeared sympathetic towards Gonta who was very confused about the virtual world, and wished to explain it to him. She also tirelessly tried to protect Gonta from being accused as Miu's killer, convinced that he is a kind soul who doesn't even kill bugs. She was shocked and saddened to find out that Gonta really is the culprit. She was especially shocked by Gonta's immense kindness after he forgave Kokichi and told the others not to blame him, and she stated that he truly is stupid sometimes, for being so kind and forgiving even in such situation. She cried heavily before and after Gonta's execution.
In Chapter 5, Tsumugi stays outside one night, looking at the stars and reminiscing what Gonta said earlier about starts being very comforting, even though the starts above the academy appeared different than usual.
As she is later revealed to be the mastermind, it's indicated that Tsumugi only acted to play this specific role assigned to her during the Killing Game.
- “Gonta is telling the truth! He's not someone who lies all the time like you!”
- — Tsumugi defending Gonta when Kokichi claims he's Miu Iruma's killer.
- “I believe you. You've been risking yourself to protect everyone.”
- — Tsumugi believing in Gonta's innocence.
- “There's no way Gonta would kill! He won't even kill bugs!”
- — Tsumugi still refusing to believe that Gonta is Miu's killer.
- “H-How nice can you be, Gonta? You really are...stupid sometimes...”
- — Tsumugi crying over the gentelmanly attitude of Gonta who's about to face his execution.
- “Alright. I'm just going to stop worrying about it. We need to live for Gonta and everyone else...and escape this place.”
- — Tsumugi says the remaining survivors need to live for Gonta.
- “I'd forgotten this feeling... With all the horrible things happening... I was always looking down... ...I need to thank Gonta.”
- — Tsumugi being thankful to Gonta.
- “I also...don't want to survive with someone who'd do such a thing to Gonta.”
- — Tsumugi refusing to survive with Kokichi, the person who manipulated Gonta into killing.
The ship sailed as a result of Tsumugi having one of her most important interactions with Gonta and seemingly caring for him the most out of everyone. However, because their interactions are still rather minor and there aren't that many of them, only a small part of the fandom is aware of the ship. Additionally, with the reveal of Tsumugi being the mastermind and not caring for the others, a huge part of the shippers abandoned this ship.
- Gonta Gokuhara/Tsumugi Shirogane tag on AO3
- Gonta Gokuhara & Tsumugi Shirogane tag on AO3
- Shirogane/Gokuhara on FanFiction.Net
- Gonta Gokuhara#Tsumugi Shirogane on Danganronpa Wikia
- Tsumugi Shirogane#Gonta Gokuhara on Danganronpa Wikia