Shinozaki Sumire finds herself in a very difficult situation, without money or people to help her, after her mother suddenly disappears. In desperation, she decides to turn to the "Free Frinds" forum to earn some money. So she meets Kaito-kun and soon realizes that he's not just a new acquaintance. She meets Kaito-kun and soon realizes that he is more than just a new acquaintance. Kaito teaches at Minatohashi Higashi Academy and considers his only weakness to be the inability to form meaningful and intimate relationships. (In short, he can't get along with girls and everyone dumped him) ..... In general he makes everything easier and satisfies his needs at the expense of love bought. That is why he is a frequent visitor to the "Free Friends" forum. Thanks to which he can date, meet different girls, have sex and in the end just pay them for their time. When he meets Sumire he realizes that she is not just another girl for a one-night stand. The violets that our heroine loves remind Kaito of his own sister that he was separated from as a child when his parents divorced. They have such a similar past and it's as if they've known each other for a long time...