Jun Kishida is a sickly high school student who can see dead people. One person in particular is following him around: his childhood friend Ryoko Hayakawa. Even after he uncovered the truth behind Hayakawa's death, she stayed by his side. As he and his classmates get into even more strange and mortally dangerous situations, Hayakawa's spirit quietly aids him. 
(Source: MangaHelpers) 
Included one-shot: 
Volume 4: Yumi-chan Kitan

Everything fell apart after the miscarriage of Nori's sister. Her husband left her and she was reduced to a depressed shut-in. One day she suddenly brought home a cute little girl called Yumi-chan, who was supposed to be her friend's kid. Nori's sister soon regained her smile, but Nori felt something was off with Yumi-chan, and the rest of her family.
 
(Source: Manga Rock)

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