|Debut||Neo Chapter 1|
Rumi Koyama (小山瑠海 Koyama Rumi) is one of the female protagonists and Class 5-3 students introcuded in the sequel Jigoku Sensei Nube Neo.
- Yuki Ou -
Jigoku Sensei Nube NeoEdit
- In Rumi's first appearance in the series, she's look smaller and thinner like the most of the other girls appeared in Jigoku Sensei Nube Neo. However, for some reason Rumi's appearance was changed into a giant girl with almost same tall as Kyoko in her second appearance in the series onward.