This author does a simple but effective story. For the main pairing, at first I had a hard time understanding why Nagase is so understanding and tolerate a lot of unreasonable demand from Niwa. But after reading it and realizing that Niwa is the one who fall in love first makes a lot of sense for me.
I always enjoy this dynamic of one person who are less experienced and a more experienced in dating. Also one who work hard but tired or insecure and a partner who is able to appreciate them.
More experienced one with a less experienced one. The emotionally reserved and the more outgoing one. The I fall in love first but insecure.
Shachiku Senpai wa Yutori Kouhai ni Sakaraenai