The review below pretty much nailed it - a young highschool aged girl seduces 2 boys from her class, 1st altogether in a 3some and then separately.
This is episode #1 because apparently this is a series. Overall, it wasn't horrible, but anime has the ability to be really imaginative and sexy and this one was neither. Plus, it was very short - about 26minutes long!
this is a terrible movie, and i use the word "movie" charitably. one has to make allowances for poor acting and scripts in porn, but jesus, this just couldn't be any worse, and there's no hot-sex-action payback for suffering through this crap. even worse, this shit doesn't even reach the "so bad it's good" level. it's just plain bad, through and through.
The teacher asks Akiyama, a geeky bespectacled boy, and Ieda, a popular jock, to visit Noriko's house because she's been absent from school for some time. Akiyama and Ieda find Noriko, a pretty girl, alone at home. They assume Noriko hasn't come to school because she has a bad cold, but to their surprise it turns out that she has another type of illness... and she can't stop thinking about sex! Before Akiyama and Ieda realize what's happening, Noriko demands that they have a threesome. This intimate act bonds them as friends.