That Mizunokoji Boy / Love Letter Trouble
The arrival of Asuka Mizunokoji, a boy as mysterious as he is elusive, intrigues the whole school and immediately raises the suspicions of Ataru and Mendo. His enigmatic, almost ninja-like behavior leaves everyone wondering about his real intentions toward the girls of Tomobiki. Meanwhile, a lost love letter causes monumental chaos when it falls into the wrong hands and sets off a cascade of misunderstandings. Between mystery and romantic mix-ups, the episode piles on red herrings before a satisfying resolution.