Kensuke connects with 'Michiru-san' on a dating website, seductive with a tantalizing beauty mark by their mouth and a knack for playing the coquette. Despite both lying about their age, with Kensuke actually being 17 and Michiru-san 26, they pursue a relationship. However, Michiru-san is shocked to find out that they are also Kensuke's teacher at his high school - a 9-year age gap between them. Upon discovering this, Michiru-san proposes to end the relationship with stoic resolve.