

Kusuo is extremely fascinated by Hiroshi and begins stalking him around the school. When this doesn't work, Kusuo secretly steps in and saves Hiroshi. Kusuo is very excited by how ordinary it all is, complimenting Hiroshi by saying that he is "blandness personified." When Hiroshi is confronted by a con-artist claiming the boy broke his shoulder, he attempts to beg forgiveness. He then has a conversation with his two friends about what each had for breakfast. Kusuo seeks Hiroshi out after both of them get the exact average rank in the school multiple times in a row.

He is described as a person with a normal common sense. He has a younger brother who goes to a swimming school. Hiroshi is from a family of four, his father is a salaryman who makes 4 million yen a year and his mother is a housewife. He is also noted to go to the bathroom for the average amount of time and use the average amount of toilet paper. Down to the millisecond, Hiroshi is timed to have the exact average times for the PE evaluation. His grades, height, and weight are exactly average. He is completely average in everything he does.

Hiroshi has his own circle of friends: a chubby guy and a skinny glasses guy. He blends into the background, so the other characters tend to lose sight of him. Someone who has boring name, common appearance, average in brains and body and has no single quality to stand out. Hiroshi was first introduced as someone who gets the same rank in school as Kusuo. He is the epitome of an ultimate normal guy, everything that Kusuo has ever wanted to be. Satou Hiroshi) is from the same class as Reita.
