Well, I've been searching for about a year for a manga that I read before i made my MU account (so it isn't on my completed or reading list). Once upon a time I wrote the chapter of the manga I read up to on my phone along with the initials of the manga. However, i completely forgot about this one and now i don't remember what the title was

the initials are Wp:a and if it helps, i wrote that i'm on chapter 113

this is probably the strangest "i'm looking for"

Hnnn just initials?

My advice is to narrow it down by genre (if at all possible) using the advanced search:
http://www.mangaupdates.com/series.html?act=genresearch
At the very least, exclude genre you know it wouldn't be.

If you read scanlations set the search to "at least one release".

Set all the parameters you can remember then skip to the "W"s.

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Thanks for helping
I'll try that

Do you remember any other details like the setting, characters, genre, etc?

The closer I can think is Wedding Peach, but it seems it doesn't even reach 100 chapters...

Another one:
Wara! Pyunuijum >> this seems likely...

thanks so much! it was wara pyunuijium, i guess i just wrote the wrong thing down