Rin Otonashi (音無 凛, Otonashi Rin?) is the most active middle sister and second sisters of the three Otonashi sisters and energetic one out of the three sisters, but is revealed to have incredibly bad memory and is always seen with her headphones (if she does not have them on, she cannot remember anything).
- Rin appears exclusively in Rosario-Vampire Capu2: The Rhapsody of Love and Dreams and is part of a group of Sirens who are attempting to gain the affection of all the boys in school with their abilities.
- Despite having the same last name as San Otonashi, they are not related.
- She, Rin Otonashi and Ren Otonashi are all sirens and all sisters.