Keita has two older step-sisters, Ako and Riko, but since they aren't related by blood, they love him in a lustful way. After a mishap at school, Ako and Riko finally confess their love to him. Keita dislikes the thought of seeing them other then brother and sister, but as he tries to enter the same school as his sisters, he slowly becomes attracted to them.
Capítulo 1 - Wandafuru Deizu
Capítulo 2 - Futarikiri no Ressun
Capítulo 3 - Miwaku no Suītsu!
Capítulo 4 - Koibito no Shikaku
Capítulo 5 - Gomen Nasai!
Capítulo 6 - Munasawagi no Akiba
Capítulo 7 - Na, Nan to~?! Bisho Nure Manatsu no Mōsōkyoku
Capítulo 8 - Hachigatsu wa Itsumo Are
Capítulo 9 - Kurushii Toki wa Kamidanomi
Capítulo 10 - Tōtō Honban
Capítulo 11 - iHi, Damedashi!
Capítulo 12 - Ichi, Ni no, San Pī!
Ova 1 - Zero Kara Hajimeyō
Ova 2 - Hitotsu Yane no Shita
Ova 3 - Futari de Kurisumasu
Ova 4 - Himitsu no Yokō Renshū
Ova 5 - Shifuku no Onsen Ryokō
Ova 6 - Gorimuchū de Muchumuchu
Ova 7 - Mumumu! na Kenkōshidan
Ova 8 - Chō Tsuyuni Saita Momo no Hana
Ova 9 - Yappari!? Haran no Kateihōmon
Ova 10 - Kuruoshiki Seishun no Ase
Ova 11 - Aru ya Nashiya wa, Jūninto-iro
Ova 12 - Itsumade mo Ī Kankei
