Isshun Shikanai

 (一瞬しかない) is an idol group formed in December 2018. They made their stage debut on January 14, 2019.

Current Members

 * Harenochi Suzume (晴後すずめ) (Joined January 10, 2021)
 * Otosaka Hao (乙坂ハオ) (Joined September 1, 2023)
 * Hirano Nazuna (平野なずな) (Joined September 1, 2023)
 * Nagai Toko (永井瞳子) (Joined September 1, 2023)

Former Members

 * Minato Haru (湊ハル) (Founding member; left May 31, 2019)
 * Yuunagi Kyoko (夕凪響子) (Founding member; left June 9, 2020)
 * Kouno Natsume (香野夏芽) (Joined June 9, 2019; left June 9, 2020)
 * Kodamayo (こだまよ) (Joined November 7, 2021; contract cancelled March 3, 2022)
 * Fuwa Frill (仆破フリル) (Founding member; graduated April 30, 2023)
 * Ginka (銀海) (Joined January 12, 2020; graduated April 30, 2023)
 * Kissa Mei (喫茶めい) (Founding member; withdrew June 30, 2023)

Albums

 * [2022.07.06] Isshun Shikanai no "First Album"! (一瞬しかないの『ファーストアルバム』!)

Singles

 * [2019.07.15] Kokokara Hajimaru Monogatari (ここからはじまる物語)
 * [2019.11.04] twinkle / Yuki to Uchuu (twinkle/雪と宇宙)

Digital Singles

 * [2020.12.10] Kono Nen no Christmas ni (この年のクリスマスに)
 * [2021.02.24] Koi Suru Onsen Girl (恋する温泉ガール)
 * [2022.06.10] Watashi no Prism (わたしのプリズム)
 * [2022.07.01] Kitto Kimi wo Suki ni Naru (きっと君を好きになる)