That Mizunokoji Boy / Love Letter Trouble
"That Mizunokoji Boy": During a baseball game at the Tomobiki High School's sports tournament, Tobimaro Mizunokoji shows up to challenge Shutarō because of a childhood incident. Tobimaro's skills and meddling from Shutarō's sister, Ryoko, make for a memorable game...
"Love Letter Trouble": One morning, Ryoko walks the Mendō's pet octopuses instead of Shutarō, and receives a challenge letter meant for her brother from Tobimaro. The letter's wording makes her think it's a love letter, but Shutarō is adamantly opposed to a relationship between her and his rival, so she asks for Ataru's help and it ends up in a most unique showdown.