Traversing the path of life involves bidding farewell amidst the arrival and departure of companions. Childhood buddies, Yuka Hanaki, Natsumi Aizawa, and Rinko Tamaki grapple with a range of emotions as they learn of Saki Mizukoshi's plans to relocate at summer's end. Determined to preserve their bond, the gang embarks on a mission to track down a mythical gem that can grant wishes. Surprisingly, their efforts yield fruit, and they discover that the tale might have some truth to it. As summer draws to a close, Natsumi and her cherished pals employ the stone to erase any regrets. Though the future remains uncertain, they will always treasure the memories and adventures from what might be their final summer together.