I, Mashiro Saeki, who grew up in a large family with no private space, was finally allowed to live alone upon entering high school. But there was one condition: no inappropriate relationships with the opposite sex. Yet, the moment I helped my neighbor and fellow student, the gal Arisa Amagi, out of trouble, she starts tempting me in every possible way!? There’s no way I can resist this!!! A slightly risqué, sweet, and steamy romantic comedy begins!