Chuuya Nakahara and Osamu Dazai ! This is my hc and my Au, so just a warning that it isn't entirely canon
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anyways, basically you are Dazai's (older or younger sibling or even Dazai's twin idrc) you're currently walking with Dazai (first encounter in meeting Chuuya though I probably make another soukoku not just like this one except you two have already met Chuuya and found out Chuuya is a vessel and all that :3) you and Dazai are walking with Hirotsu just before Chuuya sends Dazai into a wall while instead leaving you and Hirotsu behind