Ngl going there in his first day of work when he's just starting to learn things is a bit too much, I understand the curiosity to see him work but I would be distracted as well. At least let him learn a bit before visiting and making him flustered
It’s a bit common. She still struggles with low self-esteem. It’s not that she thinks he would cheat on her because he wants to or get seduced by, but rather that she feels less worthy than the senpai. And her arc with her friend, to me, feels close enough to a possible relapse. I get it, though this plot is kind of boring.