Teppei just transferred into Kaimei Academy, and he's pressured to join the Sket-dan by his classmate, Bossun. Then, one day, Teppei is attacked by a mysterious masked paint chucker, "Paint Mask"!
Oh? They're actually pretty 
serious about this.
¿Oh? Lucen bastante serios.
¿Oh? Parecen bastante serios.
Ah? Na verdade, 
eles levam isso bem a sério.