"Ever since I said 'childhood friend heroines are great,' the junior who's always been hanging around with me started claiming to be my childhood friend... wait a minute, why are you even in my old photos from back then?"

I'm Shoui Hiiragi, and I have a junior named Azusa Watanabe who's always hanging around with me. She's cute, and since we both love romantic comedy manga, our conversations always flow smoothly—spending time talking with her has been a joy for me. One day, my casual comment about "childhood friends are great, aren't they?" (despite me not actually having a childhood friend, but being a sucker for that trope) somehow changed the world. Upon hearing this, she paused for a moment before saying, "I'll become your childhood friend, Senpai." Wait, hold on—you can't just become a childhood friend by deciding to, right? Starting the next day, my life takes a dramatic turn. Azusa casually claims to be my childhood friend and comes to wake me up in my room. When I ask our mutual friends to confirm, they all say she's my childhood friend. And to top it off, she's naturally appearing in old photographs. What is even happening? This is a strange romantic comedy about a boy who woke up one morning to find he had a childhood friend. Also posting on Kakuyomu.