Boyfriend Advent!

23-year-old Asahi attracts everyone around with his innocent smile, politeness and talent. 
35-year-old Tyatani Kasiko works in a small advertising agency, she has low self-esteem.
Sato Wataru is a supporting actress in a small theater company run by her boyfriend, and sometimes works for him as a literary Negro.
Kashiko and Wataru were best friends in high school, and now they're dating again, thanks to Asahi.