Manga Debut: Chapter 57 (Ogress, Part 1)
Anime Debut: Episode 36 (Ogress)
Arisa was a member of the school's field hockey team but wasn't very proficient in the sport. She sought helpful tips from Himeko. Though not particularly outstanding, Arisa was well-liked for being attentive and kind. At one point, Himeko suspected that Arisa was being extorted by her classmate Kyōko, but it turned out to be an orchestrated act. Arisa had been voluntarily paying Kyōko to stay under the radar at school and avoid potential bullying, which she had endured in primary school. Coming from a wealthy family, she felt money was her only effective tool. After deceiving Himeko and luring her into a trap, Arisa admitted she had only befriended Himeko out of pity. This led Himeko to lose control and attack Kyōko's gang. Terrified, Arisa called Himeko a monster, and they parted ways.
Several years later, when both are in high school, Himeko and Arisa meet again at a park near their middle school. Arisa reveals she has been visiting the park daily since then, hoping to see Himeko to apologize. She finds closure when Himeko forgives her.
