Twins

Moe-rin (Moeka) attends an all girls school. Shino-chan (Shinobu) attends an all boys school. They're brother and sister twins who are very close, but Tori-chan (Professor Torikai) from the all boys school falls for Moe-rin at first sight, and Shino-chan is hot for Professor Mifuyu of the all girls school. They're still only just kids, but which twin will be first to have a sexual experience...?