Yasuhiro is one of the more cheery, laid-back students. However, he is very gullible and prone to panic. He is mentioned to be very clumsy with money and he has constant problems with debts. This trait is especially apparent when he stated that he bought his crystal ball (which is made of glass instead of real crystal) at the price of 100 million yen due to it being used by Napoleon, Genghis Khan, and George Washington in the past.