Kamen Rider BiBiBi no BibillGeiz(仮面ライダービビビのビビルゲイツ)

According to this DVD, it is said that the ghosts of a sister and brother disappeared in this school while playing here. They are still wandering around to find a playing partner, even to this day. And there is one man who awakens in this school tonight. His name is Geiz Myokoin. He has a hidden secret that he won't tell anyone: And that secret is--Oops. I can't get cursed from here on out. Now then, please watch what happens next.