These originals are The Testament of Sister New Devil.
Hentai CG
Momoiro JK Club ~Curvaceous Teen Delivery~
Mio Naruse
Link
wiki
The Testament of Sister New Devil’s Japan infomation
Official site (TV)
Official site (novel)
ALL The Testament of Sister New Devil’s trivia
The Testament of Sister New Devil is called “新妹魔王の契約者 (Shinmai Maō no Tesutamento)” in Japan.
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