Happy Yarou Wedding

This story features a college student, that everyone describes as 'cold', being hired to look after a professor's cute 5-year old son, which leads to looking after the father, which leads to falling in love, but the professor's brother doesn't approve and is willing to do anything to split them up. Features the introduction of Chiharu and Kazuki.

First in a eight-volume series, all of them can read as a standalone.

The series goes like this:
1. Happy Yarou Wedding
2. Utsukushiki Kemonotachi {BEAUTIFUL BEAST}
3. Virgin Love
4. Toriko ni Natta Kemono {Crazy for You}
5. Junnai Tokkou Taichou {Junai no Seinen}, {The Young Person's Pure Love}
6. Kemono wa Ai de, Iyasareru {Smooth over his hurt feeling}
7. Playboy Amour
8. Oboreru Kemono no Koibito
9. Men's Love