第 2144 集: 森泉桑的麻煩事登場，前往忍術學院向土井老師報仇

2144

To get back at Doi-sensei for his crushing defeat, Tasogaredoki ninja Moroizumi Sonnamon has come to the Ninjutsu Academy. However, at the Headmaster's sudden bright idea, the nintama are sent out to deliver letters to different castles. (Source: Nintama Rantarou Wiki)