Takumi and his six-year-old son, Yuji, haven't come to terms with their wife and mother's death. One day, they meet a woman with an uncanny resemblance to her sheltering from the rain near their home.
One year ago, Yūta lost his father in a car crash. Now in the 6th grade, Yūta goes to catch beetles in a dam near a mountain, a place he often went with his father. There, Yūta meets a strange old man, and while walking in heavy rainfall, slips and blacks out. When Yūta awakes, he sees a child, Saeko, who shows him a village from the past. A precious summer vacation for Yūta begins.
Based on the plot of an award-winning Crayon Shin-chan animated movie from 2002, a boy named Shinichi (Takei) does the time-traveling and meets a feared general named Ijiri Matabei (Kusanagi). Ijiri is in love with Princess Ren (Aragaki) who subsequently rejects an arranged marriage to Okura Itakatora (Osawa), a powerful daimyo of northern Kanto. Enraged by the rejection, Okura sends a large army to Ijiri's smaller state and it's up to Shinichi to change their destiny.
