satsuriku no tenshi
A 2016 psychological-horror game developed by Hoshikuzu KRNKRN (Makoto Sanada) and originally released as freeware made with RPG Maker, later adapted into a 2015 manga with art by Kudan, and a Summer 2018 anime adaptation by J.C. Staff.
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由 Hoshikuzu KRNKRN（真田诚）开发的 2016 年心理恐怖游戏，最初以 RPG Maker 制作的免费软件形式发布，后来由 Kudan 改编成 2015 年漫画，并由 J.C. Staff 改编为 2018 年夏季动画。