There’s so much happening/the happened thats it’s kind hard to even explain that specific part, The blonde haired guy is the MC who transmigrated into a game which is where the black haired guy is from, by th part that you’re on it’s been well over thousands of years since he’s been in the game (because the game resets to the time he entered it every 5 years I think? Might be wrong) and he’s kinda given up on leaving, he fell in love with the black hair guy through like a few other sessions (what the call the time before they go back in time, since they’re in a game and all) they both love each other which is hard to explain and so every time the game is about to reach a new “ending” (which is when the game resets) the MC kills the ML (black haired dude) so he doesn’t have to “live on without him”, so they’re basically dying together over and over again. It’s a lot less toxic than how I explained it and you should def give it a read, I unfortunately had to spoil that some stuff about the MC but I bet if you read you’ll still end up blown away by the plot twist lol
I’ve never read a manga this good, literally in awe of everything, everytime something new is revealed my mind explodes and left in a mess. I wish I could read this all over again for the first time but since I can’t I’ll just impatiently wait for the next chapter to be posted and once again fuck up my mind.