Hiro sports long black hair in a ponytail, along with light facial hair and thick eyebrows similar to Rentarou's.
In the chapter he is introduced in, Hiro is seen with a shirt that says "SUPER LOVE" in Japanese.
Hiro's personality can described as immature and sly while also being very protective of his daughter Chiyo. He thinks very highly of Rentarou; this was due to Rentarou pushing Hiro out of the path of a tanker truck as a kid.
Hiro is a single father who takes care of his daughter Chiyo. Not much is known of his wife, though it can be guessed that she either passed away or otherwise left her family. Nonetheless this left Hiro to be very protective of his daughter, to the point where he would orchestrate a scenario in where Chiyo would confess her feelings to Rentarou as he thought that he was the only one good enough for his daughter.
- He is the second family member of a main character to be introduced, with the first being Hahari.