[Naganain] Out the school trip bus - reasoning and post-crime

A school trip bus ride becomes a battle of bladders when a scheming teacher deliberately steers the class into a congested detour, leaving one desperate girl clutching herself and begging the boys not to look while she leaks. What she doesn't know is that classmate Ryohta has been tracking the whole setup on his smartphone, and once the truth comes out he corners the smug teacher, refuses him any relief, and forces him to soak his own suit in a humiliating, giggling payoff. A short, sharp tale of held-in desperation and sweetly earned revenge, where the prankster gets a taste of his own game and the girl gets the last word.