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

Synopsis

I'm going to marry my childhood friend. Kaori, who is eight years younger than me, is my childhood friend and neighbor. She is an angel who tells me that she will be my wife. She is more important to me than my own sister, having spent all of our childhood and adulthood together. I met Maika in kindergarten. She lives across the street. She is a cheerful girl with a mischievous sense of humor. She has been with me from elementary, junior high, high school, and university all the way to my working days, and she is a reliable childhood friend who helps me out whenever I get in trouble. Wahana helped me that time when I ran away from home when I was a child. She is a clumsy older-girl who has no life skills at all. She told me that when I grow up, if I am not married yet, she will....... It's been 1,000 days since we met. Three childhood friends. One bride. The one I will marry is.... (Source: Kadokawa, translated)