In the last year of school life, the newly appointed teacher, Yagi-sensei, arrives in a class full of boys. The students are Kokoro by Yagi-sensei as she shows off her bulging cleavage. However, the class is full of lazy students. Students who fall asleep during class... students who skip club activities... students who fake illness to get out of class. Yagi-sensei punishes these naughty students by squeezing them between her soft, marshmallow, H-cup breasts. However, far from reforming, the students just want more punishment...