During lunch break the next day, Kotonoha tells Makoto that her little sister, Kokoro, would like to meet him sometime, an invitation he gladly accepts. On the train ride home together that evening, Kotonoha appears troubled, rushing out at her stop even after Makoto comforts her. She takes the bus over the train to school the following morning and remains quiet up until lunch, where she meets Makoto on the roof and invites him to visit Sunday...