Fuko is a first year student at Hikarizaka high school. She is always alone, making wood carvings of starfish with a small knife to give to others as presents. This hobby completely drains her concentration and awareness of her surroundings. Tomoya meets Fuko in an empty classroom, carving a block of wood with a knife. Tomoya confiscates the knife after noticing she is hurting herself, but eventually returns the knife the next day. Some days later, Tomoya learns from Fuko that she is carving 700 starfish to be distributed to all the students in the school, wanting them to attend her sister Kouko's wedding. The main problem is that no one in the school knows about Kouko, who had stopped teaching at the school three years ago, except Nagisa.