Natusmi is a teacher in her early to mid twenties, but unfortunately for Tomonori, Natsumi is engaged to be married. Tomonori loves older women and Natusmi (his teacher) is the girl he is in love with.    Natsumi sometimes accidentally gets involved in some of the back-handed schemes that the main characters are doing to each other, and one time, tried to have sex with Tomonori, but the effects of the drug wore off before anything could happen.    She is a kind woman and is thick-headed when it comes to romance. She cares for all of her students and when it comes to teaching, she is very self-conscious.

Iwaki Tomonori is an average 15-year-old boy who likes older women. He happens to have a crush on his teacher, but soon thereafter, learns she has become engaged. He heads home brokenhearted, only to find a 12-year-old girl named Rizel at his home, who he learns the Japanese government has married him to against his will. Furthermore, he learns Rizel is no ordinary girl; she is a biochemically engineered human, and her creators (her "papa"s, as they are often referred to) promise to waive multiple bills of Iwaki's parents in exchange to be allowed to stay at their house, and thus Iwaki's life with Rizel begins.

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Natsumi Ihata