Zettai Ryouiki!

One day, the main character is asked for a 3-on-3 date. When he meets them, he finds all girls wear a miniskirt and knee-high socks. As he hears them enthusiastically talking about "zettai ryouiki", he gradually gets interested in it. When they arrive at a theme park, they start going around in pairs. He is confused at first, but he gradually loosens up with her and his eyes are glued to "zettai ryouiki". When they are on a Ferris wheel, she tells him that she loves him. As a matter of fact, this date was planned for her. He likes her as well, so they decide to date for a week as a test. She aggressively approaches him from the next day. As he dates with her, he gets addicted to "zettai ryouiki" and fully enjoys it. Well, what will happen to their love one week later...?