The school year after miraculously finding a way to make Koro-Sensei live normally on Earth, he continued to teach at the school he was originally assigned to. The students loved having him around more often.

One day, he was told that they would be getting a student teacher for the whole year, which everybody was interested about.

Koro-Sensei was teaching the students mathematics, when there was a knock at the door. “Nyufufu~ come in!” Koro-Sensei called cheerfully.