After receiving news of her father-in-law Eiji's sudden death, Eru Sato and her husband Takeshi are asked to formally introduce themselves as a married couple. Returning home to her parents' house for the first time in two years, Eru decides to stay for three days during the long weekend. She has one major concern: the tattoos she got years ago as a form of art, which clashed with her parents' traditional values and were especially unacceptable to Eiji. That's why she always wore long sleeves around him to keep them hidden. However, one night, Eiji accidentally spies on Eru as she sleeps defenselessly in her bedroom.