Hatsufuji Tasunobu

Akari's 54 year old husband and Shizuku's step father. He is an importer of small miscellaneous goods and his main clientele are those of high society. His office is only 30 minutes from his home by car.
He is a short fat man whose hair line is receding, however he always has a gentle smile on his face and speaks in a calm tone.
He has been suffering form erectile dysfunction for around 2 years, he feels sorry for his wife Akari who is in her prime. While he already undergoing shock treatment he ask Nozumu to have sex with his wife on the condition that he uses contraception.

Spoiler

He actually stole his wife Akari from her ex-husband 10 years ago