Could someone explain the story for me?

I'll try to make it short but basically, chapter 1 starts with setting in the past (3 years ago), and then it jumps to the present at page 14. In the past, it starts with Kazushi always seeing Rui (blonde) at the bus station. One day, there's news on the TV saying that a body was found dead in the snow. Then, you see Kazushi leaving for the bus stop to visit an art exhibition and sees a painting of Rui there. Later, he finds Rui upstairs, crying. Time jumps to the present, Kazushi goes to Rui's house and they do their thing. That's basically chapter 1.

In chapter 2 (back to the past), we learn that the body who was found in the snow was an art sensei who Rui was close with. Since they were so close, people thought something was going on between them and that sensei was a pedophile. Not only did he lose business, parents complained and management shut the place down. Rui basically blames himself for the sensei's death (? Idk if he was generally wondering why sensei died or if it was sarcasm so not too sure about this). I think the 'wanting body warmth' is pretty self explanatory lol. The end of chapter 2, like chapter 1, is of the present where they do their thing and Rui plans to make it their last time (Don't know what he's going to do/ where he plans to go though).

Ended up pretty long but hope this helped! (⌒▽⌒)

Thanks and it helped