A 16 year old teen idol and a classmate of Keima's who is currently a hit sensation for her quaint style, beauty and singing talents. While she studies at Majima Academy, she does not come to school frequently due to her busy work schedule. When Kanon finally returns to school in the story, she is shocked that Keima doesn't really know who she is and taze him as she has a slight Histrionic personality disorder as a result of people ignoring or unaware about her in the past and seeks attention from people and wants them to acknowledge her existence, hence her reason for becoming an idol. However her obsession to make Keima acknowledge her almost borderlines to Yandere tendencies which is the same time that Keima learns that she has a spirit. Keima at first tries to ignore her as unlike his past targets, Kanon tries to win him over rather than the other way around and fears being taze again but when he sees her turning invisible due to the power of the Weiss when she feels depressed, he figures out Kanon's problem and changes strategy by supporting her whenever she feels depressed which she does by sending him an obsessive number of emails. After Keima helps boost her confidence, Kanon is about to make her big performance at Narusawa Seaside Hall but soon gets second thoughts as she fears she will mess up and be forgotten again, she turns invisible and leaves her concert. But Keima finds her and encourages to believe in herself as she doesn't need to seek peoples attention to prove her existence as her hard work to become an idol was the proof all along. Encouraged by his words, she thanks him and kisses him (forcing the spirit out) before returning to her concert to do an amazing performance where Keima acknowledges Kanon as a shining star.
After the events of the concert, Kanon becomes more confident and loses her need for attention seeking, yet she blushes whenever she meets Keima. It is later revealed that Kanon is the host of the Goddess Apollo and has begun remembering her lost memories with Keima thanks to Apollo's powers. However, she becomes the target of Fiore of Vintage which causes Kanon to be paranoid to the point she reveals to Keima she still remembers him and confesses her love to him in front of their class. But before Keima can do anything, Apollo takes over and runs away but is soon stabbed by Fiore with an enchanted cursed dagger. She was kept in a coma by the dagger but after reviving the second Goddess, Vulcan, the dagger was released and Kanon's life was put out of danger although she still is comatose due to Apollo's power "sinking", which upsets Keima but later decide to search for a third Goddess to heal her completely.
In the past, Kanon was a member of the pop idol group "Citron" with her bandmates Yuri and Lime before she went solo. Despite Citron's break up, her bandmates hold no animosity against her and even encourage her new solo career. Kanon also wears glasses but only uses them when she's at school and in private.
The cause of Kanon's negative emotions was her doubt and fear that people would not acknowledge her existence.
Her surname was mistakenly written as Nishihara by the author in the Magazine serialization, but was later corrected in the manga volumes to her real surname Nakagawa, which is derived from Ise-Nakagawa Station(伊勢中川駅Ise-Nakagawa-eki?).
