Yoshi is walking along a mountain path with a butterfly net and basket in hand when he notices an unfamiliar girl in a phone booth. The girl notices Yoshi looking in his direction and calls out to him. The girl's name is Sachi, and she seems to be having trouble getting through on the phone. Yoshi can't leave her alone and goes inside the booth. But then the butterfly net gets stuck in the door, preventing him from getting out. Yoshi takes off his clothes to escape the heat, and Sachi hesitates, but can't bear the heat and takes off her clothes too. Yoshi sees Sachi's figure and becomes sex-conscious. An insect flies out of the insect cage Yoshi is holding. Sachi panics and hugs Yoshi. Yoshi is struck by the softness of Sachi's female body.