Suiiki is a popular manga written by Anonymous. The story is translated to English and covers Fantasy, Seinen, Slice of Life genres. read-manga.org releases the latest English translated chapters of Suiiki and can be read for free.
DESCRIPTION
From Anime News Network:
The fantasy-themed story centers on a middle school student on the swim team during a mysterious summer vacation.
While training at school during a drought a young girl faints from heat exhaustion. She instantly finds herself in the country side by a cool, clear river. Every time she falls asleep she is drawn deeper into this alternate setting.