‘I can’t just leave her alone’ is the start of love. Kurumi Yumeno, a girl who’s just moved in next door, and Minato Kawabata, a college student who started chatting with her by chance. Worried about Kurumi who’s so carefree and a bit of a klutz he shares a meal with her one day, talks about his favorite books with her. He wants to get closer to her, but he still doesn’t know how to become someone special to her. This is the bittersweet story of the “big brother” and the neighbor “Kurumi-chan.” --- Note: Originally self-published, it was collected for a commercial volume release on 2026-06-26.