The characters can all "break" the other characters with pretty much no real effort and with a 100% success rate.

She bounces around between being a s*x addict, Shota addict, and Kohei yandere over and over again.

She goes from Shota crush, to Shota r*pe victim, to Shota simp, to wanting revenge, to Kohei simp, to Kohei yandere (trying to stab Urara), to Shota yandere (stabbing and killing Kohei), to I don't even know (Sleeping with Urara in front of Kohei's dead/dying body).

He goes from play boy, to Sakura crush, to Urara crush, to Urara blackmail victim, to Urara simp, to depressed for betraying his friend, to Urara simp, to falling back to Sakura as a last resort.

He goes from happily dating, to betrayed and wanting revenge, to moving on to Sakura, to wanting to break Urara, to telling Urara they can be together if she gets an abortion, to dead.

Sakura teamed up with Kohei at one point to get revenge on their partners cheating on them. This is fine or whatever until the last chapter. Sakura doesn't feel good in bed with Shota anymore, who is only with her because Urara cut off contact with him to be with Kohei, so she decides it's Kohei's fault she can't be happy with Shota anymore and she kills Kohei... Then has s*x with Urara right in front of his dying body and Urara, who seemed like a Kohei yandere, is just cool with begging Sakura to make her feel good right then and there. This is how the main route of the story ends... Just like that.

My biggest issue with this story and especially this alternate route is how Kohei feels at this end of this all. Spoiler alert: He's the only one left alive in this poorly named "Sakura's route". Sakura kills Urara and Shota then Kohei kills Sakura. In the final chapter, he is release from prison and feels bad about everything that happened up until now. This is understandable because people died. But then all of my understanding goes out of the window when he says that it's all his fault because he didn't just ignore it when his girlfriend and best friend were cheating together...

So this story ends with him killing a coworker because she was interested in him and he decided he had to be alone because of the trouble he caused. Neither route ending is a reasonable ending in any way and this story stays in the realm of insanity all the way until the end.