Mutual warmth

Two step-siblings, Shitori Tachibana (the mother's child from a previous relationship) and Natsuna Tachibana/Shiono-miya (the father's child from a previous relationship), begin living together due to their parents' remarriage. Just as a year is about to pass since they started living together, their parents inform them of their divorce and that they will be living separately in one month. The two siblings are thrown into chaos upon hearing this news, but Shitori proposes to Natsuna, "Let's make memories." Natsuna, having no particular reason to refuse the proposal, agrees. At first, Natsuna was swept along and deeply worried about the impending second separation, but gradually begins to want to forget everything and simply enjoy their time together. Meanwhile, Shitori attempts to convey her true feelings to Natsuna indirectly, but it doesn't go smoothly, and her way of expressing herself becomes increasingly direct with each passing day. When Natsuna hears Shitori's true feelings, how will she react? And what are Natsuna's true feelings? On the day of their parting, the answer the two of them give will surely be one without regret.