Hideaki, a son-in-law who inadvertently lives with his son-in-law, Lina, at his own pace. One day, Rina gets sick and depressed just after making a mistake in the part-time job. Hideaki sympathizes with Lina, who is dismayed by her family, and helps her find a job, but Hideaki notices Lina's over-abundant big tits and gradually becomes unable to suppress her desire.
