13 Nichi wa Kinyoubi?

Ema is obsessed with ghosts, and is even part of her school's occult club. She'll do anything that has to do with some crazy superstition about ghosts or spirits, and make sure that she goes out of her way to do it. Ema is known for this at school, and the series follows her pursues to find ghosts. Ema, unfortunately, cannot see the things that she loves, unlike a few of her friends...

(Source: StarryHeaven)

Included one-shots:
Volume 1: Shuugaku Ryoko no Susume
Volume 3: Time Capsule and Happy End no Tsukurikata