When I was 8 years old, my father remarried. My new mother, Ruka, was beautiful, kind, and very kind to me, even though I wasn't her biological son. I loved Ruka so much that I foolishly thought we would get married Itsuka. But when I realized that would never happen, I distanced myself from her and left home. I continued to be obsessed with my first love for 20 years, but I never got a girlfriend and still had feelings for Ruka. Then, I got a call from Ruka, who had fallen ill.