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One day, listless part-timer Tamura Nana was summoned out of her room and into another world, after which her summoners declared her a saint and asked her to save their world. However, though she was hailed as a saint, it turned out that Nana possessed no magical power at all! To make matters worse, she was chosen as a partner by a princess who can't use magic... The helpless saint who has no magic and the powerless princess who can't use magic. And so begins the adventure of these two leftover heroes!
A yuri romantic comedy centered on a temporary relationship between a gal and an honor student. The story begins when Manatsu, a gal who is on the verge of repeating a grade, starts receiving tutoring from Sumie, an honor student. Manatsu loves shoujo manga and romantic gossip but has the vague that having a boyfriend somehow doesn't fit her. When she casually brings this up, Sumie suggests, "Why not try starting with just the form?" and offers "How about dating me for just 7 days?"