I know the following blurbs are grammatically incorrect. I copied the exact description from the back of each manga. If you have any problems with that, then, uh, sorry? I also put the ISBNs for reference.

Vol 01: One day, a girl appeared before the boy suddenly. She said that it was an "angel" about herself. (ISBN4-8402-1528-6)

Vol 02: When a boy had gotten used to new life, he met a mysterious girl. Then, that girl became a parasite by living with his neighbor. (ISBN4-8402-1692-4)

Vol 03: From that time, something may have changed little by little. He has always had the ability to see spirits. But now, he was beginning to have the ability to see other mysterious visions. Then, he started to notice a change in his heart. (ISBN4-8402-1798-X)

Vol 04: The girl failed the examination. So because of that, they began to think about themselves and their relationship. During that time, a mysterious girl appeared and many things were happening amongst the two and their friends. Time marches on. Everything changes gradually. (ISBN4-8402-1984-2)

Vol 05: The boy was able to lead a peaceful life despite everything going on with the mysterious girls next door. But one day, one of the girls disappeared. The boy had a dream in which he discovered he could find out more about the missing girl at his mother's childhood home. Upon hearing that his maternal great-grandfather had collapsed, he soon had the opportunity to travel there, where he found the girl. (ISBN4-8402-2110-3)

Since I can't read Japanese, I cannot tell you whether there's a huge discrepancy (in terms of story line) when the series was transformed into anime. Graphics-wise, I noticed that the manga has a little bit of, ahh, gory stuff in it such as blood oozing from Misha's forehead and stuff.