Shinpei had a very close relation with Kaori and at somepoint Kaori acted as Shinpei's surrogate sister, such as helping Shinpei doing his homework, going together to amusement park and even sharing each other about their feelings and thought.
Shinpei had a very close bond with Kaori, and at some point Kaori acted as Shinpei's surrogate sister, such as assisting Shinpei with his homework, going together to amusement parks, and even sharing their feelings and thoughts.