English teacher Irina’s assassination mentor makes an appearance and the two compete-using special agent Karasuma as their target. Another transfer student/would-be assassin joins the class- accompanied by a guardian who claims to be Koro Sensei’s…little brother?! A tentacle showdown ensues- sending everyone into a tentacle tizzy. Then- the 3-E students face humiliation yet again during a school baseball exhibition match. Plus- more secrets of Koro Sensei’s mysterious past revealed…! For teen audiences.