Shinako is a classmate and friend of Aiko Morimura, studying alongside her and participating in group activities with classmates like Ryo. She owns a shy and curious dog named Baron, who befriends Spank. Shinako joins group outings such as a trip to the plateau and a barbecue event with Aiko, Ryo, Serino, and their pets. She is also present during events involving Rei, including his departure to study in Vienna.