When the goddesses Belldandy, Skuld, and Urd win a free trip to a hot springs resort, it turns out they're not the only deities off on vacation. Demon First Class Mara is checked into the same rustic retreat!

"Can there be too much of a good thing? For Keiichi Morisato, who lives with three sister goddesses -- literal goddesses -- the good-thing limits are tested on a daily basis. When Keiichi accidentally contacts Peorth, an old friend and rival goddess of his girlfriend Belldandy, Peorth shows up with the assignment to make Keiichi happy...whether he likes it or not! Peorth decides that what Keiichi needs is...well, intimacy (if you get the drift), and...

Now that Keiichi and Belldandy are the "item" on campus, they are constantly solving problems, mostly those created by his friends in the N.I.T. Motor Club. When it's all over with, Keiichi just wants to sit back and relax with a video, but then a second goddess enters his life--Belldandy's sister Urd.