Mr. and Mrs. Kojima have been married for five years and are living a very normal life. One day, his wife Yuka's brother-in-law, Yuki, came to the Kojima family. As a convention every weekend, the family of three is supposed to have a meal. On the surface, Tomoki looks like he's being bothered by his older brother's nagging, but he actually has a certain "fun". It was to scavenge for Yuka's used underwear in the washing machine and sniff her scent!
