Sometime in the distant future, Kurumi, Saki and Karinka share an apartment with another girl named Excelia. One day, after school, Kurumi tells everyone that she is in love with a man she met named Michihito Kagura, but she does not know when she will see him again.

Source: ANN

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Alternative setting: Koutetsu Tenshi Kurumi
Alternative setting: Koutetsu Tenshi Kurumi 2-shiki