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Kazuya is Sumi's target for practice dates because of Chizuru's favor. However, Sumi has shown signs of romantic affections towards Kazuya as the series goes on. She almost confessed when they were watching a dolphin show.
Different than any other Rental Girlfriends of Kazuya, Sumi decides to keep on supporting him even if she won't be with him; showing her willingness to change and move on
Chizuru acts as a mentor and friend for Sumi within the agency.