Grandpa Loses Control: Rei in Danger

S1, E30: Grandpa Hino has become emotionally unstable, with angry outbursts or sudden bouts of tears, causing Rei to become worried. Grandpa Hino's new apprentice Yuichiro tries to cheer up Rei by explaining that her grandfather's odd behaviour is because of the weather. Realizing that Yuichiro likes Rei, Usagi tries to help their relationship along, only for it to backfire big time.