Ace Sakata Hayato of the usual gentleman soccer club suddenly started playing. Humble Ayumu, who became the youngest professional player in history, was asked in the interview about "good attacking method" and "crushing (man's) money!". And was pulled around by doing messy action. Obviously strange something like that was very strange. Matarou suspects that it's because of "Guess Note", one of the seven wonders of the school. It seems that the person whose name is written in The Guess Note will act like a "Mess". If that's the case, it's time for the YSP Club. Jinpei and his colleagues decided to go to the library where Guess Note was said to have appeared first.
マタロウは学園七不思議案件を疑って…。
超エリート校・Y学園には、多くの謎が存在する…。その謎に立ち向かうのが「YSPクラブ」。彼らはなんと「妖怪HERO」へと変身することができるのだ！そんな彼らに、妖怪史上最大の謎解明ミッションが下される！
ジンペイたち「YSPクラブ」を待ち受けているのは、輝かしい未来か、それとも…？まだ見ぬ新体験が、キミを待っている！
Y学園…いや、この世界最大の謎を解明せよ！！
