Carry means mobile phone in Japanese. There is always -END- at the end of the text message.
Shido is a person who is not good at expressing himself, and he is inevitably awkward in dealing with emotions. As for her childhood sweetheart Chiki Tian, she had a cheerful personality since she was a child. She and Shindo were brothers and occasionally complained about each other. Shindo always thought that this would be fine.
However, as one of the leaders of the baseball club, Chiki was accidentally hit by a newcomer's bat during the baseball club's rookie orientation, so she dropped out of school. When she came back, she was supposed to be one year older than Shishito and became a second-year Hyotei student...