This is "I Won't Be Buried in My Husband's Grave" by Miwa Kakiya. After her husband's sudden death, the protagonist, Natsuhako, who was burdened with the heavy responsibility of being a "daughter-in-law," reclaims her own life with a refreshing story of turning her life around, using the Termination of Affinity Relationship Notification (commonly known as "Souzoku") as her weapon. I read it once with a book cover. There are no noticeable stains, but please understand that this is a used item stored at home and inspected by an amateur. - Title: I Won't Be Buried in My Husband's Grave - Author: Miwa Kakiya - Publisher: Chuo Koron Shinsha Thank you for looking.