Kawataro, half human, half kappa, lives as a human, because his father, a kappa, wished so. Kawataro travels to find his mother who disappeared when he was young. On his trip, he encounters various youkai.
Water Friend Kappaman is a completed manga by Tokuhiro Masaya, first published in 1995. It blends comedy and adventure. You can read all 22 available chapters of Water Friend Kappaman online for free on MangaPulse; the newest is Chapter 22, added 2024-07-08. The series is finished, so you can read it from start to end in one go.