Daichi, who lives with Maika, brought a foreign exchange student, Michael. Maika, who was interested in English, became interested in Michael, and the two got along well. Michael, who spilled his drink, accidentally showed his big dick on his pants. Maika, surprised by the size that was completely different from her boyfriend's, became very interested in the big dick. The two, who gradually began to be aware of each other, cross the line.