Rion, who was in love with her senior from her university days, Kanna, ends up working for the same lingerie manufacturer. In her second year at the company, she is married and feeling fulfilled, but one day she is ordered to go on a business trip to Tokyo with Kanna. After the business meeting is over, the two check into the hotel. "I'll be sharing a room with my senior..." Rion can't hide her nervousness, but a few minutes later, they visit a mixed bar and kiss Kanna. Little does Rion know that their two-day, one-night business trip sharing a room will turn into an unforgettable lesbian story...