Midori is a relatively tall boy with messy short hair and a bandage on his cheek that he never takes off for some reason. He has a prominent snaggletooth on the right side of his mouth that projects outwards, but it's rather small.
His sleeves are always pulled up to his elbows, and has his dress shirt is unbuttoned at the top. He wears a green undershirt underneath it, and wears his blazer tied around his waist.
When not in school, he wears large, clunky brown boots.
Sena and Midori have mutual crushes on each other, but for the longest time they did not confront each other about it and merely watched each other from their positions on the train. Like Sena, he wanted to properly talk to her, and continuously practiced greeting her in private.
Their interactions truly begin when she's given him umbrella to use during rainfall, marking the first time they really talk with each other. He returns the umbella the following Monday, and after a while he asks to exchange numbers with her, eventually working up to hanging out together on the weekends and then finally dating.
They seem to be close friends, enough for them to pick on each other. Haruki is usually one to tease Midori about what he says or does.