Moon Can Bus Card

At the station convenience store, she always buys two bottles of water - one for herself and one to pass to the stray cats outside the window. Until one day, there was a small note next to the cat bowl: "Your water, my can, does this count as a life exchange?" She looked up, and the boy opposite held up the same water bottle and shook it. Later, they rented an apartment, and she asked: "Why did you choose me?" He pointed to the moon: "Because when you fed the cat that night, the moonlight was yours, the cat was yours, and I became yours."