The story centers on the life of Hideki Motosuwa, a repeat student attempting to qualify for university by studying at Seki prep school in Tokyo. Besides a girlfriend, he dreams of having a persocom (パソコン, persocom?): an android used as a personal computer, which is expensive. On his way home one evening, he stumbles across a persocom in the form of a beautiful girl with long hair lying against a pile of trash bags, and he carries her home. Upon turning her on, she instantly regards Hideki with adoration. The only word the persocom seems capable of saying is "chi" (ちぃ, Chii?), thus he names her Chi. Hideki assumes that there must be something wrong with her, and so the following morning Hideki's neighbor Hiromu Shinbo tries to analyze her with his mobile persocom Plum, and after Plum crashes concludes that she must be custom-made.

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