Yajima, a naturalist, had ventured deep into the forest to collect specimens. He discovered what appeared to be a red mushroom, but it turned out to be nothing more than a vibrator. Suddenly, he heard a human scream. Rushing toward the sound, he found a boy named Toro collapsed on the ground. Realizing that Toro had been bitten by a pit viper, Yajima desperately sucked the venom from the wound. Just then, Hanamura appeared; seeing Yajima—who had also accidentally switched on the vibrator—he jumped to the wrong conclusion and attacked with a Japanese sword. Yajima skillfully dodged the strike and countered. Yajima then took Toro back to his home...