坂上 龍樹

One of Eiji's former classmates and his best friend in his hometown. He is Shino's younger brother and works part-time at a restaurant.

Tatsuki is heads over heels in love with Noriko, the moment he mets her.
He has a huge collection of porn, which he tries to hide from his elder sister, but isn't shy to share with his best friend Eiji.