Suiiki

You are reading Suiiki manga, one of the most popular manga covering in Fantasy, Seinen, Slice of life genres, written by Urushibara Yuki at MangaBuddy, a top manga site to offering for read manga online free. Suiiki has 17 translated chapters and translations of other chapters are in progress. Lets enjoy.
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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.