Kimi Ni Koisuru Sanshimai

in the world of daily full-throttle dedication to his studies, there's itsuki, a high school boy. the reason he's putting in so much effort into his studies is to reunite with his first love, a girl named amane, and go on a date with her. while he's immersed in these study-centric days, by a twist of fate, he ends up living together with amane and her sisters, shion and mone..!?