|Debut||Never Back Down On Love|
|Japanese Voice||Mariya Ise|
|English Voice||Felecia Angelle|
Eriko Oniyama (鬼山 江梨子 Oniyama Eriko) is Kureha Tsubaki's classmate and a member of the Invisible Storm, as well as the second leader of the Storm, appointed as leader after Konomi Yurikawa's death. She is seduced and manipulated by Mitsuko into becoming the leader in order to ensure Kureha's exclusion so Mitsuko Yurizono can target and eat her; however, Ginko Yurishiro and Lulu lure Eriko to the flowerbed and eat her as part of a plan to protect Kureha.
Eriko makes a minor appearance in the manga, having a friendly conversation with Kureha post-makeover.
- The name Eriko means "bay, inlet" (江) (e), "pear" (梨) (ri) and "child" (子) (ko).
- Eriko's surname Oniyama means "demon" (鬼) (oni) and "mountain, hill" (山) (yama).