Pochi to Goshujinsama♥  

ぽちとご主人様♥

Chiwa is like Hiro's little sister, but they didn't make a marriage promise. Instead, they agreed to maintain a relationship similar to that of a dog and its master with a toy choker. When Chiwa left for England with her mother, she promised to return and attend the same school as Hiro one day. However, when she learned that her mother would remarry Hiro's father, she worried about their promise. She returned to Japan and asked if he remembered their agreement. Chiwa offered to become Hiro's pet and requested that he love her deeply.