My childhood friend, Amaterasu, has always been like a sister to me. We never even considered each other as members of the opposite sex until she suddenly started showing interest in me... She's been begging me to teach her everything about kissing, holding hands, and having sex... *Note that the recorded content may vary depending on the distribution method.

幼馴染の天月とは兄妹のような関係だ。お互いに異性として意識した事なんて一度もなかった。だけど、僕に彼女が出来た途端に天月は僕を意識するようになったみたいで…キスの仕方、手の繋ぎ方、エッチの仕方…全部私に教えて欲しいとおねだりしてきて…。※ 配信方法によって収録内容が異なる場合があります。