The story begins with Keita Suminoe, a male third-year junior-high school student studying for his high school entrance exams. He is living in a home with his older twin stepsisters, Ako and Riko, who share no blood relation to him, and they help him prepare for his exams. Even though he initially dislikes himself for it, he begins to become attracted to his two step-sisters, and his two parents encourage him to eventually get married to one of them.
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| Visual Effects | Shinichi Tatsuta | Lead Animator |
| Directing | Munenori Nawa | Series Director |
| Art | Naoko Kosakabe | Art Direction |
| Writing | Katsumi Hasegawa | Series Composition |
| Visual Effects | Tomoyuki Shitaya | Character Designer |
| Sound | Yuiko Tatsumi | Theme Song Performance |
| Sound | Ayana Taketatsu | Theme Song Performance |
| Production | Yuuichi Yamada | Producer's Assistant |
| Production | Masayuki Haryu | Development Producer |
| Production | Junichi Ika | Development Producer |
| Writing | Ditama Bow | Original Story |
