Sudden Downturn!! The First Date Is the Beginning of Disaster (E19)

Finally a happy couple, Lisa and Ōtani go on a date to the World Champtionship in Atheletics. But the date is horrible, with being late, forgetting bags, and more. Then, Lisa randomly remembers Ōtani's graceful ex-girlfreind Kanzaki. And what a surprise, when she returns from getting drinks, Kanzaki is right there. Lisa instinctively tries to run away. But Ōtani introduces her as his girlfriend, which causes Lisa to cry tears of happiness. But right after that, they meet Ōtani's neighbor Mimi. The moment he had introduced her as Lisa as his girlfriend, Mimi begins to emit an aura of jealousy. (Crunchyroll)