A couple of years ago I read a manga about a guy who didn't want to exist, and so he tried to kill himself. Before he was able, a girl told him to live with her and they made a deal that between certain times she would pretend like he didn't exist.
An action would trigger her ignoring him, though I don't remember what. It may have been a clap or a snap but afterward she would behave as though he wasn't there.
It wasn't strictly romantic, but the guy ended up slowly growing closer to her and in one chapter he slept in her bed.

I initially found the manga on MangaRock, but since that is long gone I've gotten desperate. This manga has plagued my thoughts and I have spent hours looking for it. I made this account entirely to ask this question.
I appreciate any help! Manga similar to what I described would be awesome, even if they aren't exactly what I've mentioned. Anything which could help me find this manga.
Thanks 🙂

Toumei Ningen Kyoutei

Next time you're looking for something, Advanced Search + Categories/Tags will be your best friend, I found this by searching under a tag combo of "Cohabitation" and "Attempted Suicide".

Awesome! Thank you, I did read the "Tips for searchers" thread made by Darknova42 and Juneau. I tried advanced search and ended up looking through all of Cohabitation, but I guess I just missed it.
Again, thanks a ton for your time.