Rainbow Fireflies

One year ago Yūta lost his father from a car accident Now in the 6th grade Yūta goes to catch a beetle at a dam on a deep mountain Yūta often went there with his father There Yūta meets a strange old man Due to heavy rain Yūta slips and falls down a bridge He becomes unconscious When Yūta awakes he sees a child Saeko in front of him Saeko takes Yūta to a village that looks like something that existed 30 years ago Yūta has the feeling that he went into the past He also meets Kenzō who is the same age as Yūta They promise to go catch a bug the following day Saeko then takes Yūta to an old house An old woman there treats Yūta like a cousin Yūta doesnt know what is going on At night the strange old man he met earlier appears and tells Yūta that he will belong to this time period for a month A precious summer vacation for Yūta begins