Based on the erotic game by Beelzebub. 
 
His name is Kareki Tsunetaka. He has been a so-called security officer at his home for 20 straight years. In reality he’s just a shut-in. I re-married to his father, bringing along with me two daughters, Sayaka and her younger sister Yuki to live with him and his father. However, Tsunekata does not find this agreeable. He causes trouble for us as he tries to make us leave. His target is Yuki. She seems to be doing something in her room lately. She apparently is worried about her bust size, but she’s already plenty cute. Oh no, Tsunetaka is staring at her with a scary face. I feel like this has happened before… Am I just imagining things? If only I made that decision at that place and time…

Based on the erotic game by Beelzebub. 
 
Tsunetaka Kareki. Codename: Noir Set. 
 
He is a private home security officer with 20 years of military experience. Exceptionally trained in technology and intelligence gathering, he perceives and records the smallest of details of the home to which he is dispatched. 
 
His new assignment is directly from his father, Takao Kareki. He must look after his father's new lover, a potential bride. Nothing but the best professional will do to keep her safe. But in her home, he sees all. 
 
(Source: DLsite English)

Based on the erotic game by Beelzebub. 
 
Guarding his home for many years he has been consistent in his duty. However many new sluts end up in his home and are threatening to take his inheiritance. Armed with cameras and willpower he commits to blackmailing them so he can have his way with them and take back that which is his.

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