The OVA doesn't pretend to be anything more than a breather between manga volumes, it knows exactly what it is and executes that premise with actual craft. The comedy lands because the timing between Ui's deadpan reactions and Izumi's transparent scheming creates genuine friction rather than recycled gags. It's built for the person who just wants to spend thirty minutes with characters they already like, in a scenario that has no stakes and asks for nothing but your laugh.
Ui Wakana, the student council president, starts a campaign at school to encourage holding hands. While she is putting up posters, her husband Hayato Izumi, who serves as her vice president, hurts his hand when he tries to keep her from falling. Ui feels responsible and wants to make it up to him, so she helps him bathe, even though he keeps saying he can manage on his own. Their marriage traces back to a deal their parents made when both were three. A single-episode comedy with ecchi content, it was bundled with the limited edition of the manga's ninth volume.