Anetomo

Getting teased at home wasn't enough, apparently, since he's now stuck in the same school and the same literature club as his sister and childhood friend Shinoa. The club needs a summer competition win or it gets shut down.

To keep it alive, the girls agree to help him with the workload, and they pay in kind for the effort. His sister Eimi isn't having it, though, and turns the whole thing into a personal war to keep him away from the rest of the club.

The player mostly keeps the club running while managing which girl gets his attention and how far things go with each of them, with the sister's jealousy pushing back at every choice. Multiple endings mean the tug-of-war between duty and family actually has consequences.