Ten years after losing his father, Hiroaki has lived alone with his mother, Misaki. Misaki worked hard to support Hiroaki on her own. Witnessing her dedication, Hiroaki gradually began to see her as someone deeply important. However, once Hiroaki reached adulthood and her parenting duties were complete, Misaki started pursuing her own hobbies and dreams, embarking on a new chapter of her life. Growing resentful that his mother no longer paid him the same attention she once did, Hiroaki finally resolves to confess his feelings during a private trip she invited him on.