The high school boy protagonist turns to his childhood friend and neighbor Rio who's a university student, to help him study for his college entrance exams. Note: the untranslated oneshot "Open Family" is not a...

Ayano Okazaki (28) has a childhood friend, Tsukasa Nanamiya (28), who has been close to her since she moved next to him when she was little. The two used to play innocently, but Ayano felt an insurmountable gap...