A Confrontation with the Ex-Girlfriend?! The Epic Breast-Baring Battle!! (E10)

Lisa and Ōtani are slated to go to a Christmas party. This party is a reunion of his middle school basketball team and Ōtani's ex-girlfriend Kanzaki is who invited him. However, she unexpectedly cancels and doesn't show up. At the party, Lisa asks Ōtani's old teammates about Ōtani and Kanzaki's past. Apparently Ōtani confessed his feelings to Kanzaki after being locked into the gym equipment room. Based on that, Nobuko and her friends arrange for Lisa and Ōtani to be locked into their gym equipment room. When history doesn't repeat itself for Lisa, she loses hope. Meanwhile, a lone Kanzaki gloomily looks up at the Christmas sky... (Crunchyroll)