Japanese schoolgirl movie

I remember the later half of the movie, in which a schoolgirl wearing a blue swimsuit is inside a classroom with 3-4 other guys which fuck her one by one and all of them creampies (at least one of them fucks her while she is bent over a desk, but i dont remember other positions. The first half of the movie is inside those PE Locker rooms with only one guy, but i might be wrong. Please help me find this, this movie haunts my mind for at least 10 years and i just cannot find it anywhere.