So... I was pretty far into it but then... I lost it; it's a group of trainees, the main character travels back and time and wishes to fix whatever doom is going to befall upon the company, while also trying to keep the group together and make it to debut. So far... he's basically romancing everyone but before he traveled back in time... he was in love with only one of the guys and also became his manager.
I'mma camp here
So basically there is this guideverse BL, it's a mix between guideverse and transmigration. The esper and guide seemed to be in a relationship, the guide passed and moved into the body of this guide who used to be a really low-level guide and hated by everyone and he is trying to get close once again with the esper who is on the verge of breaking down because he refuses to be guided by anyone else.
approximal guide?