Within a few days, the protagonist is exponentially smarter, stronger, and more charming, and is developing stronger relationships with the female characters.
Three weeks later, the girl from the future returns.
First, it is necessary to talk with the characters in order to build a relationship.
The three main forms of stats are: strength, which can be improved by fighting and swimming; charm, which can be improved by winning swim races and having sex, and knowledge, which is obtained through studying.
All three of these attributes will help the player form relationships with the game's characters.
Meanwhile, on the way to Fight Club, the hero encounters Ryuji.
Ryuji wants the protagonist to avoid all of the girls in town, who he feels are rightfully his.
When she wakes up, she has completely forgotten who she is.
The protagonist convinces her that she is his pet kitten, and that she should stay in the basement from now on.
Eventually, players can give them gifts and go out on dates.
Talking to the girls during dates will prompt the players to answer questions about their personal information.
His hired thug beats up the protagonist and steals the necklace.
Ryuji's family is too powerful for the protagonist to call the authorities, so he is forced to accept this turn of events. Other than a few story elements, the player is free to do what they want.
It is now his duty to take care of her on a daily basis.