Keitaro moved to his grandma's apartment building to cram for a college entrance exam. Too bad nobody told him the complex is for ladies only and that he's the new manager. The job has some perks: girls frolicking in the hot springs all day and lounging in their naughtiest nighties all night. It's definitely gonna be tough for Keitaro to focus on studying, especially if one of his titillating tenants turns out to be his long-lost love.

When he was a child, Keitaro made a promise to the one and only girl who ever liked him. When they both grew up, they'd go to Todai (university) together and live happily ever after. Now, at age 19, Keitaro has applied to Todai and failed twice. After being kicked out of his house by his parents, Keitaro seeks refuge at his grandmothers Hinata Inn. Unfortunately the inn has been converted to an all-girls dorm and Keitaro must pass a test far greater...