Rui has just exploded yet another toilet in the school bathroom. He runs down the hallway with a smirk on his face, managing to evade the many teachers trying to chase him down. It’s a daily occurrence for him; causing trouble around school, yet using his smarts and clever machines to avoid being caught.

Until… someone shouts out to him. A goody-two-shoes, trying to stop him from causing trouble.

“Gah, why won’t you shut up?” Rui sighs. “I’m in a hurry, so see ya~!”