Kaminoyama Mea

The protagonist's junior who goes to the same school as him. She is a hit with the juniors at her part time job and is one of the few fondly remembered seniors there.

She is a bright and positive mood maker, so the more she's bullied, the more she shines. She finds her identity in being messed with, so if she's not bullied, then she'll find a way to bully herself.

She's prone to feeling lonely, so she has a habit of thrusting into any place where people are gathered. She often looks like she is seriously listening to what people are saying, but in truth she has very little brain capacity, so she rarely remembers what was said. Due to that, she fails many times, but tries very hard in secret to improve.

And yet, she is a genius when it comes to getting easily carried away and then looking smug about it, which, naturally, irritates those around her.