It has been one year since Tsukune entered Youkai School. After spring break, Tsukune hurries to school to reunite with Moka-san only to collide with a mysterious girl on a bicycle who was also extremely cute. In school, Moka and friends were quickly surrounded with fuss by the new students. In addition, a large amount of fan mail was found in the shoe cabinet of Moka which came from the new students who also adores her, but there was one special letter. A dangerous threatening letter that said, "I’m taking your life."

The new girl at school shares quite a history with Moka - they’re sisters! Back in the day, Moka was able to defeat her younger sibling every time they sparred. Now it looks like Kokoa is out for vengeance!

Tsukune's decision to use a portion of his time on the field trip to pay his mother Kasumi a visit at home that is meant to be a quiet heartfelt family event, begins its metamorphsis into a circus when Moka follows Tsukune home, much to Kasumi's shock. But before long, the madness that usually fills Youkai Academy finds it way to Tsukune's home.