I saw the small explicit box on the cover, but I didn't fully process that. haha
I don't really read yaoi so dunno if I should rate it. It's written by a woman and has a lot of problematic tropes a lot of people are aware of. I know people can like this and acknowledge the issues. This crosses my personal line. If you like it, okay, but if you're similar to me maybe consider a few things:
Includes: domestic violence (physical altercation) and rape

I don't completely shit on it (i think) I include some other thoughts at the very end.

Once it crosses over to the above list I personally feel very uncomfortable with it. The main couple went out before, but had a break up and once they ran into each other again in college the romance started as well. But so did the issues that drove them apart before.
Hase has a way of not being emotionally vulnerable with Taichi. Once they become lovers again everytime they're conversation shifts to more emotional things, or Hase gets jealous he initiates sex.
At some point Taichi gets tired of it and asks for them to just watch a movie. Hase tries to initiate again, but Taichi says no. They argue. Physically hit each other (Hase hits him first). And then Hase starts to penetrate Taichi. I know rape in yaoi is common (sadly), but it doesn't have to be. I'll leave it at that.
I think it's also stalker-like to change majors to follow Taichi.
I think Hase hasn't changed. He admits it himself. Just because he admits it doesn't mean its okay now.
Also after Taichi was raped he alienated himself from his friends. He was hurt. But eventually he went back to school and put on a happy face and it broke my heart. His thoughts were on how to remain friends with Hase, but that is the authors doing. As if he'd feel comfortable ever being around him-
But the author had to make Taichi seem like it wasn't a big deal, otherwise how is it romantic?- stopped being romantic when the love interest is a stalker rapist but oookayy.
There was also a subplot where one of the girls liked Hase, Taichi tried to set them up. Not much interesting happened there. Just a plot device for jealousy and Hase to ultimately profess his true feelings.

Also theres drunk sex near the beginning which was the first red flag. Shoulda known.

Problematic shit aside-if it didn't romanticize this relationship it shows how complex and messy relationships can be. If it wasn't seen as a romance it would be a good example of toxic relationships with domestic violence- yeah.

There was a part where Taichi was wanting to name what they had. He wanted them to be family because he wanted to be close to Hase who was keeping him emotionally distant. I thought that was interesting. Not friends, more than lovers. What word?
Also Taichi resigned their future cause what would they be able to be? They can't be an out gay couple. They can't have a typical family. When the world around you doesn't accept you or your dreams they become impossible. When you don't see yourself in society, you don't exist.
And it's weird to say this yaoi reminded me of those things, but it's true. So maybe it wasn't all bad? Nah it still disappointed me and made me a bit sad.

Also use a condom! Not just sometimes! Protect yourself.