(Sorry in advance if the descriptions are bad!)
Batou Shoujo
46 chapters, 1 page per chapter
This one isn't, well, I mean. It's, uhm. I think it's just the [AUTHOR'S
BARELY NOT AT ALL DISGUISED FETISH], but it definitely made a very strong impression. Read it if you want something unique.
Kitanai Kimi ga Ichiban Kawaii
26 chapters, 28~ pages per chapter
Similar deal as the last one, but now it's got a plot!!! And yuri. Still messed up, and still a very "fun" work. I think about quotes from here to this day.
Spectral Wizard
3 chapters, 65~ pages per chapter
A real darling of a work, I only vaguely remember the plot, but it did
not feel like only 3 chapters, it's easy to find yourself engrossed in this one (hot tip, there's a sequel!)
She Doesn't Know Why She Lives
This is a better descriptor then I'll ever be.
I have so, so many more - but I need to go check out the ones the others suggested. I don't need a life anyways ヽ(*´^`)ノ