[i]Arya Sometimes Hides Her Feelings in Russian[/i] (Japanese: 時々ボソッとロシア語でデレる隣のアーリャさん, Hepburn: Tokidoki Bosotto Roshiago de Dereru Tonari no Ārya-san), abbreviated as [i]Roshidere[/i] (ロシデレ), is a Japanese light novel series written by SunSunSun and illustrated by [[momoko (momopoco)|Momoco]]. It was originally published online as two short stories on the novel publishing website "Shōsetsuka ni Narō" from May 6 to May 27, 2020, respectively. It was then acquired by Kadokawa Shoten, who have published four volumes and a short story volume since March 2021 under their Kadokawa Sneaker Bunko imprint.

A manga adaptation by [[tenacitysaho|Saho Tenamachi]] will begin serialization online on Kodansha's Magazine Pocket website and app in October 2022. An anime adaptation by DogaKobo has been announced to air on July 3, 2024.

h4. Synopsis
[[Alisa Mikhailovna Kujou]], who attends a private school, Seirei Gakuen, is a high school girl with silver hair. Her unparalleled looks can make anyone turn around if she walks past them. [[Masachika Kuze]], the benchmate of Alisa, is an unmotivated student who just sleeps at school and always plays gacha games. Alisa sometimes expresses her thoughts in Russian so that Masachika won't understand. However, unbeknownst to her, Masachika understands Russian as well at the native level.

h4. Characters
* [[Alisa Mikhailovna Kujou]]
* [[Maria Mikhailovna Kujou]]
* [[Masachika Kuze]]
* [[Suou Yuki]]
* [[Miyamae Nonoa]]
* [[Kimishima Ayano]]
* [[Narahashi Elena]]
* [[Suou Yumi]]
* [[Kuze Kyoutarou]]
* [[Sarashina Chisaki]]
* [[Taniyama Sayaka]]
* [[Kiryuin Sumire]]
* [[Kenzaki Touya]]
* [[Kiyomiya Hikaru]]
* [[Maruyama Takeshi]]
時々ボソッとロシア語でデレる隣のアーリャさん ロシデレ