I reunited with my pure and lovely childhood friend at my new school. ~But the childhood friend's definition of "childhood friend" is clearly strange and heavy~

I, Keiichi Otani, reunite with Chika Tachibana, my childhood friend, at my new school. Chika, who had always been with me since we were little, had become so cute that she received confessions from students across all grades. However, it turns out that she rejected them all for the reason that "I have a childhood friend." Holding hands on the way home from school, living together, and even bathing together and sleeping in the same bed as a matter of course. Being willing to risk our lives for each other and constantly supporting one another. That was what Chika considered a childhood friend to be. Wait, hold on. Isn't that more like... a married couple? Also posted on Kakuyomu.