A Magical Girl belonging to the Tokime Tribe who loves nature. She was invited by Shizuka and her friends from Tokime's branch village to return to Kamihama, where she used to live a year ago. Due to her deep knowledge of plants and animals, she works as a nature guide while living in the Hokuyo Mountains, surrounded by nature.
The following is a summary posted on 4chan's /pmmm/ general
Chika gained a strong distrust for people after her dad become a guarantor for his childhood friend in the village who then disappeared immediately after. This crushed her happy life so far (loving father and mother with good job, her essay on nature is good enough to enroll her in St Lilliana Academy which is for the rich and smart) and Kyubey took this opportunity to ask for contract. She wished for her family to be able to live peacefully surrounded by nature.
Her dad dejectedly decides to move back to the village, something he had not done despite being chased after for repaying loans since he did not want to sacrifice his daughter, but realized everything is for naught when he saw her ring. Things went back to normal until Shizuka invites her to Kamihama again.
Chika helps Shizuka elude con-men as they head to the phone stall to buy one for Shizuka. Shizuka respects Chika's careful nature and thanks her for it.
However, Chika is still suspicious of others, even Shizuka, which is why she decides to stay in the woods instead of living together in the temple. A storm destroyed her soon-to-be finished tree house, and she dejectedly decides to seek shelter in the temple.
It is then that Shizuka brings along the whole Tokime Tribe in Kamihama to help Chika finish her house. It seems she never intend to force Chika to do anything, and Chika realized her taking Shizuka's offer is her attempt to give her trust to people she actually can depend on in the city which she used to love. Things end on an upbeat note as the tribe finish the house together.
Costume Stories
Chika Aoba's Costume Stories
When Chika told her parents about her plans to play in the river with her friends, they gave her a sum of money for a swimsuit. On the way, she is apprehensive, as she isn’t used to carrying around so much, but is determined to not let it go to waste. When she arrives at the store, she’s left stumped by the large selection of swimsuits, so she quickly dials up Asahi for assistance. However, the connection was unstable, and kept cutting out, leading to Asahi’s misunderstanding of Chika supposedly going diving with a harpoon, and gives her advice for hunting as the signal continues to buffer. Through this vague advice, Chika is recommended a swimsuit that is green, and prioritizes lightness over protection, along with some flowers for extra camouflage.
After acquiring the swimsuit, Chika meets up with the others at the river, who comment on how her swimsuit perfectly matches the environment. It’s then that Chika connects the dots and realizes the miscommunication, but since the swimsuit turned out to be a great choice, she doesn’t mind one bit.
