突然女子に呼び出された先に待っていたのは、いつも真面目なガリ勉女子たちと…学校イチのヤリマン女子！？「今からこの子たちにエッチのやり方教えるから手伝ってね！」とヤリマン女子がボクを相手にセックス講座開講！！「キスは超大事だよ」「ちゃんと男子を気持ちよくしてあげるのがコツ」「ゴムなんか着けたら気持ちよさ半減じゃん！」と周りで真面目女子がメモを取る中、あれよあれよとヤリマン女子の超絶テクにキンタマ空っぽ！…これで終わりかと思いきや、翌日から真面目女子たちから「この前の…私もやってみたいんだけど…」と復習のお誘い！エッチも真面目な女子たちと最高のスクールデイズの始まり～！！

I was suddenly summoned by a girl, and what awaited me was the usually serious, studious girls and… the school's biggest slut!? "I'm going to teach these girls how to have sex, so help me out!" the slut girl said, giving me a sex lesson! "Kissing is super important," "The key is to make the guy feel good," "Using a condom cuts the pleasure in half!" While the serious girls around me were taking notes, I was quickly emptied of balls by the slut girl's incredible technique! …I thought it was over, but the next day the serious girls started inviting me to practice again, saying, "I want to try what you did the other day…" The best school days ever began with sex with serious girls!