In the last episode of season 2 Kaoru can be seen visiting an Aquarium with Anzu Takanashi. He also appears during his brother's wedding along with their parents.
Mitsuru is Kaoru's father.
Kie is Kaoru's mother.
Hikari is Kaoru's older brother.
Anzu is Kaoru's girlfriend.
- The name Kaoru means "fragrance, fragrant" (薫).
- Kaoru's surname Tsutsui means "cylinder" (筒) (tsutsu) and "well, mine shaft, pit" (井) (i).