TONIKAWA: Over the Moon for You (2020)

S1E3 Sisters

Nasa and Tsukasa have just embarked on their journey as newlyweds. They visit a bathhouse owned by Arisugawa Kaname, a girl Nasa knew from middle school. Kaname is taken aback to see Nasa with a partner and is eager to uncover the story behind their marriage. While Nasa catches up with Kaname, Tsukasa enters the bath and meets Kaname's sister, Aya. Curious about Tsukasa's relationship with Nasa, Aya inquires about it, to which Tsukasa responds that they are family.