Y School Heroes

Y-Academy has completely returned back to peace. On the way to school, Mataro sees someone who looks just like Jinpei. Over-flustered from these events, Mataro also said that there was something that looked like a cat Yo-kai behind him. While Mataro makes a fuss in the clubroom about how he may be a Jinpei doppelgänger, Jinpei gets hungry and heads out to eat. Then, immediately, he meets his doppelgängar, something said to kill him if he does? Not only does the existence of Y-High School come to light, but Mazera - who they thought they defeated - appears in the schoolyard as a whole new threat!

Jinpei's middle school has been requested to "leave the school" by the high school student council president, Suguru Gomanda. The vulgar middle school, which has had many mysterious incidents and has damaged academic ability and reputation in the past few years, all tell them to leave the school. It is Jinpei who asks the school president to say gatsun to the high school club, but there are circumstances which cannot be helped by Daiouji. The next day, the high school student board did not appear to attack anything, and Jinpei and his friends were relieved. However, during class, when Jinpei, who wanted to go to the bathroom, offered to the teacher, suddenly a warning sound resounded. What is the "elegant" withdrawal guidance strategy by the higher division?

The president of the High School, Suguru Gomanda, ordered the middle school students to leave the school within a week and declared that he would launch a tear gas attack on those who did not respond. In order to directly talk to him to cancel his total withdrawal, Ranto, Jinpei and his friends went to high school. In the high school area where Jinpei arrived in a school trip mood, there was a unique atmosphere of an Ancient Romantic style. And there are posters of a woman who seem to be everywhere, and the woman is in the beauty processing mode of the souvenir package, the character of the game, and "Puricola". Who is she? And who is the true person who is demanding the total withdrawal of the middle school?

Jinpei and his friends are warped from the wormhole to the legendary world of super ancient civilization "Atlantis", which is said to have prospered a long time ago. They are surprised by futuristic cities and people that do not seem ancient. And Lana's identity, which has been hidden until now, is revealed. The leader, Amana Etoramusu, says she wants to have the power to save Atlantis, but what is happening to Atlantis, which must have been promised infinite energy and eternal prosperity? A new battle between Jinpei and others that has made another era begins now.