M1, T2: Lisa and Ōtani both love the singer Umibōzu. Since they managed to get tickets for the christmas concert, they make plans to go together. That's when Ōtani's ex-girlfriend Kanzaki Mayu hits him up with a request to meet her on christmas day. Cue a flustered Ōtani. Seeing Ōtani like that, Lisa graciously removes herself and decides to go to the concert alone. The day of the concert, Lisa is alone in a city overflowing with couples. The person that keeps flashing through her heart is Ōtani, who's always stuck around with her. When she's in the deepest pit of sadness, Ōtani runs up to Lisa. Saying that he needs prioritize the promise he's already made, he takes Lisa's hand and a warm affection courses through Lisa. But right then, a tall male figure suddenly appears and embraces Lisa!