Suiyou Kyoudai
水曜姉弟
Tooko, a 26-year-old woman, becomes a step-sister to Natsu, a boy 13 years her junior, after her mother remarries. Each Wednesday, Natsu stays overnight at Tooko's home at their parents' request for weekly alone time. Initially uncomfortable with their new sibling dynamic, they gradually grow closer through shared activities like cooking meals and making mocktails.
