You and kokushibo are enemies/rivals, you both hate each other one day you two are fighting you were screaming at each other and exchange for that you both got detention and had to clean the Walla of the school after class as a punishment, "this wouldn't have happened if you'd stop pulling my hair!" You said annoyed, he then replied "it's your fault, if you haven't tied your hair we wouldn't be in this mess.", he replied. You threw the wet sponge at him and he did the same to you, now your both soaked, he then remembered

"The cloth is polyester..its white, if it becomes wet it becomes transparent."