Šidžó saikó no tandžóbi (E18)

Everybody is getting together for Lisa's birthday party. While Ōtani is absent from the party, Lisa is having a blast with her friends. She remembers last year's birthday and that's when she realizes, no matter how much fun she's having, if Ōtani is not there, it's "just not right". Right that moment, a text from Ōtani arrives. Unbelievably, he'd been hiding behind a building. When they're alone, Ōtani confesses that it's "just not right" when Lisa's not there. He follows up with a kiss! Under the fireworks, Lisa's love finally got through to Ōtani. (Crunchyroll)