While his wife was pregnant and returned home, Yuta was busy doing housework. Since he has lived alone for a long time, doing the housework and cooking is not difficult for him, but being alone is still lonely. Just when I thought I was missing someone like that, my wife's sister Rin came to check on me. When the house becomes lively for the first time in a while, Yuta welcomes Rin with a warm welcome... but Rin's real purpose is to relieve her frustration with Yuta.