Due to her shy personality, Reina has ended up spending her days alone, far from the college life she had envisioned with her friends when she was a high school student. She is so Kokoro that she finds it difficult to continue college life like this, and now, during her spring break in her second year, she is planning to go home and think about her future. Just then, on the way back to her parents' house, she bumps into Mizuno, her former teacher from her high school days...