Manga by author Ojiro Makoto

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From MangaHelpers:Fujiyama-san is 181 cm (Approx. 5' 11'') and she is the ace player for her school's volleyball team. Kanba-kun is 160 cm (Approx. 5' 3") and has known Fujiyama since their preschool years. With his prankster friends, Kanba peaks into the girl's locker room right when Fujiyama is undressing. From then on, he could not get the image of Fujiyama out of his mind, so he decides to ask her out. She says yes. Enjoy their naive and secretive relationship as Kanba ogles his tall girlfriend in many different situations. [DrCoke]

2nd grade junior high school kid Shirai Sachi (14-years old) gets tutored by the beautiful and easy-going woman Chabatake Nana (21-years old). Although she slacks off when tutoring, actually not helping his studies at all, for Sachi it's all fine and dandy. Being alone together with a hot, older woman in his own bedroom, frolicking around, unintentionally revealing neathage, or just lying down on his bed, with her bare long legs or the cleavage of her ample breasts in perfect view. Who could complain? It's an adolescent boy's fantasy fulfilled!