Tenshi na Osananajimi-tachi to Sugosu 10000-nichi no Hanayome Days

is a Japanese light novel series written by Yusaku Igarashi, with illustrations by Tandan. The series began publication on December 10, 2022 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
'''It's been 10,000 days since I met my three childhood friends. I'm going to marry my childhood friend now.''' "From now on, I will marry my childhood friend." The neighbor's childhood friend, Hanaori-chan, who is eight years younger than me. She is an angel who tells me that she will be my wife. A person who is more important than a real sister, who has been together all the time from childhood to adulthood. Maika, whom I met in kindergarten, lives across the street. A ghost girl with good communication skills. She's been with me from elementary school, junior high school, high school, to when I started working. Wakana-san, who helped me when I ran away from home when I was a child. She's a shoddy older sister who doesn't have the energy to make a living, and when I grow up, if I'm not married yet, at that time...she's my childhood friend. "It's been 10,000 days since we first met." Three childhood friends. One bride. she's going to marry me...