Mr. Yoshioka

"'And I may be stupid, but at least... I go after girls my own age.' - Rei Kashino to Mr. Yoshioka." Mr. Yoshioka was the English teacher at Rei and Kira's school. In the art studio one day after school, he sexually harassed Kira, only to be stopped by Rei. Mr. Yoshioka was then exposed by Rei the next day in class, and eventually quit his job over what happened. Besides sexually harassing under aged girls, Mr. Yoshioka is shown to be vengeful and dismissive, especially towards Rei.

Biography
Mr. Yoshioka was first seen teaching his English class, specifically trying to get Kira to speak louder when reading her English reader, and at the time seemed empathetic, looking to defend Kira when other students were making fun of her for being quiet. After Rei claimed there was a rat in the class (to cover up Kira gasping loudly after she and Rei talked about her drawing), the class got excited, and Mr. Yoshioka attempted to calm the class down. However, later that day when Kira was in the art studio, Mr. Yoshioka walked in and began feeling her up. Kira was unable to speak out, but Rei came in just in time to return Kira's hairband and saw what he was doing. Immediately, Mr. Yoshioka stopped and tried to act innocent, but Rei already knew what he was doing. Mr. Yoshioka dismissed Rei as being too stupid to draw, but Rei countered by saying he "goes after girls his own age". Mr. Yoshioka got extremely defensive, but freaked out when he saw Rei pick up a razor blade, which Rei claimed was just to sharpen his pencil. After Rei joked that he wasn't "thinking of cutting up [Mr. Yoshioka's] face", Mr. Yoshioka ran out of the room. The next day, Mr. Yoshioka called Rei (who was sleeping in class) to the front of the room to answer a hard English question, thinking it would embarrass him. Rei however is very fluent in English and instead exposed what Mr. Yoshioka did. Mr. Yoshioka frantically attempted to erase what he wrote, but the class had already seen and talked among themselves about whether it was true.

After school, Mr. Yoshioka cut the brakes on Rei's motorcycle in an attempt to presumably kill him, but Rei managed to stop safely. After getting his bike repaired, Rei encountered Mr. Yoshioka in the school stairway, and told him if he was "gonna play", they should "go all-out." It's heavily implied Rei thought about or did attempt to mess with Mr. Yoshioka's brakes in retaliation, but it is unknown whether he did or if he was just threatening him. Mr. Yoshioka quit his job the next day.