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: