From a young age, she spent every day immersed in swimming, aiming for the Olympics, but an injury brought her down. Now, she works late into the night as a swimming instructor. Overtime, overtime, overtime. Sonoko Rion is a pure and earnest woman who dedicates herself to everything. When you call her out after work and invite her on a date... The door to her suppressed sexual desires opens! A kiss upon arrival, kisses whenever their eyes meet while talking, kisses, kisses, kisses, kisses while driving and stopping at red lights...