I'm going insane. There was this manga/one shot/single story in a collection (I honestly cant recall) about...

An MC who comes home to his best friend's ghost in his room? He's been standing in his room for like 3 days and it looks like he's talking, but there is no sound. It doesn't seem like the ghost friend can see the MC, nor can the MC interact with him.
Eventually the sound starts catching up the MC in the real world and that his soul was like... on some star?? and which is why the sound was delayed because 😕 it was coming from the star?!
Anyway it frickin ends with the ghost boy suddenly disappearing and the MC listening to the rest of the things his ghost friend was saying to him... and he learns that his ghost friend was basically talking about how he wished he confessed to him while he was still alive...

It was super depressing and I want to find it again...

please send help lol

It's the 6th story 'Stars spica spectre' from touch me again.