Ep. 4: Romantic Christmas Eve! What Does the First Kiss Taste Like? / I Can't Go Back Empty-Handed! Let's Go to the Make-Out Park!

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Jealous of Chika’s success, Yamada attempts to seduce Kosuda on Christmas Eve. After a library encounter, Kosuda asks her out, but their date goes awry. Misinterpreting earrings as a sexual advance, Yamada drags Kosuda to the love hotel district. He attempts a kiss but fails, prompting her to headbutt him before fleeing. Kosuda abandons his sister’s schedule to follow her, believing the kiss secured their relationship. Yamada updates Takeshita, then meets Kosuda at a love park filled with couples. While Kosuda fears losing control, Yamada is actually eager. Inexperience delays intimacy until they discover the park is monitored by perverts, leading to cancellation.