It's school trip time! Tenma hopes to sit next to Karasuma on the bus, but Harima snags the seat first. A bathroom break mix-up causes Harima to board the wrong bus, leaving the coveted seat open again—but can Tenma seize the opportunity?

While staying with his cousin Genko, Harima is blackmailed into revealing his awkward past—including how he met Tenma and why he wears sunglasses. Little does he know, Tenma is sitting right behind him, hearing every word...

Tenma ends up locked in the gym's storage room and finds only one thing to eat: ultra-spicy curry bread! After surviving that ordeal, she finds herself facing a new one—alone time with Karasuma at the hospital?!