This is a very believable adult nicomaki.
Thats one of the best things about it- it was all super believable and like it could go down in real life- one didnt love the other while still in school just saw her as a friend.. Maki lacked the courage to confess- but also thought it wasnt possible because of Nico's idol status.. but then years later it comes out, and Nico is willing to try..
A great story. I wish there was more doujins for them like this and a few less sex focused ones (tho I like those too lol).