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1998-1999, 3 Volumes
Plot Synopsis: (taken from Anime News Network)
Injured by a car accident while looking for her missing cat, an elementary school girl (Hotaru Shiraishi) was hospitalized, and during her stay she met an apparition of a friendly high school girl (Mizuki Mochizuki) in her dream, who gave her a ring as a token of friendship. After her recovery, this little girl and her friends set out to find the mysterious figure, not knowing they are about to unravel a stranded love story beyond their comprehension.
Notes:
Adapted into a live-action movie in 2004 starring HYDE (L'arc~en~Ciel), Chiaki Kuriyama (Kill Bill), Hiroki Narimiya (NANA 1 and 2).