Ryuujin-sama to Kurashitara

Too late for breakfast, much less to take his time on the way to school, Nao decides to take his emergency shortcut. Through the local shrine and flowing bellow the bridge ahead is the river he used to play in as a kid, except now is all dried up. A child is sleeping peacefully on the river bed and, more shocking than that, is finding out the child is a deity that was supposed to protect that same river.