In Majo Memory (Jitsugyononihonsha Bunko)

[Machine Translation] When Takashi Ono, a novelist in his 60s, peeked into an empty well in his backyard, a sweet smell wafted from the bottom. As if lured, he climbed down, only to find something looming over him. It was Kisemi, the messenger of the Great Demon King. When Kiseyemi presses him into a relationship, Takashi is given special powers by the Great Demon King, and he receives a mission to cast the wicked into hell. He also suddenly becomes very popular with beautiful women who appear one after another...

還暦の小説家、小野高志が裏庭の空井戸を覗いて見ると、底から甘い匂いが漂ってきた。誘われるように降りてみると、何かが迫ってくる。それは淫魔大王の使い喜世美だった。喜世美に迫られ、関係を持った高志は、淫魔大王から特別な力を与えられ、悪者を地獄へ落とす使命を受けることに。そのうえ突然モテるようになり、次々と現れる美女たちと―。