Nami lost his parents at a young age and later lost his grandfather who raised him. Nami closed off his heart from the world, only holding on to the words of his grandfather. Nami then meets Shimura and Nagaoka, who change his view on both the world and friendship. As a last memory of high school, the three of them go on a hitchhiking trip to northern Japan and have an unforgettable time.

The story of a would-be actor, his larger-than-life classmate and their friends. Unfolding their past and present, Sasaki in My Mind looks head-on at adolescent sparkle and the pathos of bygone days.