A lively schoolgirl named Konomi enjoys her class trip to the fullest, but she accidentally breaks a valuable vase during their stay at a hotel. She is punished by her strict teacher Tsubasa, who orders her to sleep alone in a separate room. Later that night, while lying in bed, Konomi feels someone touching her breasts under the covers. When she opens her eyes, she sees Tsubasa fondling her own nipples! Terrified yet aroused, Konomi can't speak as Tsubasa continues to tease her breasts and pussy until she orgasms uncontrollably. The next day, embarrassed about her large breasts, Konomi decides to take a bath alone. But just when she thinks she's alone, Tsubasa appears with her massive boobs...

快活な女子●生、こなつは待ちに待ったクラスメイトとの修学旅行を存分に楽しむが、宿泊先の旅館で高そうな壺を割ってしまう。とっても恐い女教師、つばさに罰として別室での一人ぼっちの就寝を命じられる。夜も更けた頃、布団の中からモゾモゾとおっぱいを揉む手が忍び寄る。目を覚ましたこなつが見たものはさっきまで怒っていたつばさ先生が自分の乳首をコリコリと弄る姿。恐怖と快感でまともに声も出せないこなつはおっぱいもマ●コも舐められ、イカされてしまう。次の日、大きなおっぱいにコンプレックスを持つこなつは友達とは別で一人で温泉に入るが、そこへ大きなおっぱいのつばさ先生が現れる…。