Kugayama Seigo

The protagonist of this work. He appears to be a refreshing, gentle young man with decent looks. He used money earned from stock trading during his university days to live a leisurely NEET lifestyle. Perhaps because he made a fortune at a young age, he couldn't find purpose in life and was bored out of his mind...

About half a year ago, he met the heroine who moved into the apartment next to his. He developed a crush on her and began harboring the desire to impregnate her and to sow his seed.

Due to his innate meticulousness, he leads a very regular life and keeps himself reasonably fit. Thanks to his looks and financial means, he's never had trouble with women and has extensive sexual experience. He also possesses a remarkably large penis.