[Crossover] Society, That's My Brother

In other people's citadels, Yamanbagiri is shy and bashful. In our citadel, Yamanbagiri is a streetwise big bro. Everyday life in other people's citadels The master sends you out to fight. You head out silently. Everyday life in our citadel Bro, let me handle this! The Saniwa and the Tsukumogami cling to Big Bro's leg. Big Bro, that's enough. Stop fighting. Gintama world Big Bro: You're Okita Soji, right? You're a little... different from the legends, but that doesn't matter. Let's fight. Okita Sougo: ...Sorry, my name is Okita Sougo. Bleach world So this is the Soul Society? So I'm already dead, huh? Well, then I can fight as much as I want. Katekyo Hitman Reborn! world Big Bro: You guys are pretty interesting. Want to fight together? Tsunayoshi Sawada: N-no, Big Bro, please don't cause trouble. Other worlds If I don't give you a beating today, you'll never know why the flowers are so red. Just so you know, I haven't been a big bro for many years. I'm Big Bro, streetwise and ruthless. Ambiguous romance (pure-love direction), no CP. A warning (underline this): Yamanbagiri Kunihiro is the one who gets possessed. His personality is completely different, completely different. Lots of original settings.