"Supposed to be a busy autumn sightseeing season, yet..." laments AYASE, a bus guide working for a struggling tourism bus company. To revive their slumping sales, she's assigned to lead a top-secret tour. This mysterious trip provides her with a bright blue suit and voluptuous lingerie, but no information about the destination or itinerary. As she ponders, "Could showing some cleavage really double our sales?" AYASE departs on the bus. However, things take a sudden turn en route—passengers start groping her breasts and buttocks nonstop, subjecting her to relentless sexual harassment. Any resistance triggers a barrage of complaints... Why? Why??? In reality, this tour is actually a planned event called "Sexual Harassment-OK Lewd Lewd Bus Tour + α John." With no choice, she's forced to endure constant groping and provide blowjob services to the lewd passengers to boost the company's sales. But thanks to one suspicious passenger who sneaked onto the tour, the lewd bus adventure spirals into an utterly unexpected direction.