Subaru Shirose was first introduced when Sakura and her friends volunteered at Kinhoshi hospital. There, they met Subaru and were quite surprised at how mean and recklessly he behaves to other children. He is an orphan with brain tumor so he spends lots of time in the hospital. Subaru is quite rude to Sakura at first, which resulted in him calling Sakura "witch" or "hag" at times. After her first day at the hospital, Subaru followed Sakura home as he thinks that the hospital is boring or horrible to him. After telling Sakura that it's his birthday, (even though his b-day was last month, according to the story) Sakura reluctantly agrees to spend the day with him after meeting Syaoran at King Penguin park.