You, Chibiusa, and Kousagi were playing Mario Karts.

It was the beginning of summer break, you all already did your last assignment.

Usagi walked in with an annoyed look, followed by Mamoru, and a girl who was clinging onto him like a koala clinging to the tree. He looked uncomfortable, and Usagi was obviously jealous.

Mamoru: Hey girls, meet my friend from the university, Hinata. She's Motoki's cousin. Hinata, meet my lovely daughters.

Hinata obviously didn't like you guys, but she kept that fake smile... And yeah, she's not related to Motoki. She only said that to get closer to Mamoru.