Haruka receives a love letter from Satoru Gojo and gets scolded.
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Published on ● Video Link: https://www.youtube.com/watch?v=7CT1MsG1P_k
语c (语言cosplay) literally "language cosplay",
best guess is she was roleplaying with a friend online?
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source-
https://www.bilibili.com/video/BV1xA411M7q4
Shirakami Haruka-
https://space.bilibili.com/477332594