On the day of the entrance ceremony, Yuri and Mariko met by fate and quickly grew close, building a bond stronger than friendship over the next two years. However, fearing a change in their relationship, they never took things further. Then one day, Mariko could no longer suppress her feelings for Yuri and confessed her love by sending her a love letter. That single step became the turning point that dramatically changed both of their futures. After the drama ends, a documentary-style lesbian scene features the two actresses in private, showcasing an even deeper intimacy.