A beautiful office lady in her second year of working life, Yumin, joins a surfing school to find a new hobby. The surfing lesson begins on the sandy beach under the blazing midsummer sun. The handsome instructor wears a wetsuit, while Yumi is in a swimsuit. "Yumi-san, is this your first time?" the instructor asks. "Yes, it's my first time! I'm looking forward to it///" she replies. The lesson starts with a surfboard, and the instructor explains, "Since it's tough to go straight into the sea, let's first study on the beach before heading out." "Yes, sensei!" Yumi responds. "Yumi-san, are you flexible?" he asks. "I am!" she answers. "Great, let's start with stretching," he says, and they loosen up her hip joints with a straddle stretch. The instructor guides her step by step, and Yumi's fair skin glistens with sweat under the summer sun. The lesson progresses as she actually gets on the board, pressing her breasts against it for paddling practice. Then, they finally head into the sea. As the sun sets and they return to the lodge, the instructor double-checks in a private room whether she really remembers today's lesson. "Sensei... could it be you're getting turned on?" Yumi asks. "Huh? What are you saying? lol" the instructor laughs. "It's fine... it's summer, after all..." she says, and the real wave-riding begins. Like riding a big wave, the indoor beauty gets a creampie.