"3-E student Isogai breaks the school rules by working part-time to help support his family. When Gakushu and rest of the Big Four students find out, they use his secret as leverage to force 3-E to participate in a bizarre sports-day competition. Soon it's time for the school's midterm competition as well, but when some 3-E students accidentally injure the elderly owner of a day care/after-school program, Koro Sensei forbids them from studying and orders them to replace the old codger until he recovers. Assassination is one thing, but...babysitting little kids?! And then our friends rescue a cat."--Page [4] of cover.