Himawari!

Himawari Hinata transfers to Shinobi Gakuen to train as a kunoichi, her dream since being saved by a ninja as a child. On her first day, she meets Hayato Madenokoji, a new transfer teacher, who saves her life. Unbeknownst to Himawari, Hayato is not a skilled ninja, but rather a man teaching ninjas about normal society to repay a debt. As their paths intersect, Himawari discovers that Hayato bears the same mark on his neck as the ninja who saved her in her youth, setting the stage for a complex and intriguing relationship between these two characters.