It's episode four, and we're introduced to Mr. Furu, who's just returned from a trip to the dentist. He's super excited to be back, but he's also a little worried about what's going to happen to his nerves when he gets home. He asks to be brought back to his room, but the dentist says he'll wait until he gets there. Mr. furu's a little nervous, but then he realizes that his nerves aren't as bad as he thought they would be, so he decides to rub some oil on his nerves. He says that the nerves in the back of his neck are starting to get twitchy, and he wants to make sure that they're not getting twitchy at all. He wants to rub the oil on the nerves so that they won't be twitchy when he sees him. He also wants to massage the nerves on the sides of his legs, so that he can get a better feel for how his legs are feeling. He tries to rub oil all over the legs, but it doesn't seem to help. Finally, he decides that he just needs to press the oil into the nerves, and the nerves will be soothed.