13-nichi ni wa Hana wo Kazatte

The story is about a live-in helper named Naou Matsudaira. She is employed by the Murano family, which consists of the printing shop owner and widowed master of the house, his four sons, and their grandmother. Every 13th day of the month, the family visits the grave of their deceased wife and mother. Matsudaira meets a trembling cat on one of these grave visits.

(Source: Anime News Network)

Note: It was originally a one-shot published on March 20, 2019. It later began serialization on April 12, 2023, with the original one-shot serving as the first chapter.