Birthday: October 25
Height: 175cm
Blood Type: AB
Club: Flower Arranging Club
Song: Hanafubuki Reflect
Power: Selfish Flower

Sadamatsu is the lone member of the Flower Arranging Club, so he doesn't have a lot of friends to talk to and instead makes himself busy with talking with and taking care of the academy garden. While he always seems sad, helpless, and lonely due to this, he gets happy whenever someone approaches him and talks to him.

He's an extremely my pace person and always has a poker face on. However, his expression will slightly change to a delightful one if someone is willing to join his club or if he gets interviewed. He is also known to be elusive, not standing out, prone to biting his handkerchief when he gets disappointed, and a collector of plushies when he was young. He is also fond of tea, always bringing a cup of it everywhere, just like Kyoma's fondness of milk.