Warai no kenkyuu

Bungaku ni arawaretaru warai no kenkyuu

Sei no modae to bikushou no kenkyuu : warai no dendou

Warai to warai no geijutsu

Warai no tetsugaku

Warai no kansatsu

Warai no kura

Warai no oukoku

Baiin to baishoufu no kenkyuu

Furousha to baishoufu no kenkyuu

Warai wa kenkou no moto

Warai no kuni : kyuuka no tomo

Shimobashira no kenkyuu nuno no hoon no kenkyuu

Autarukii no kenkyuu

Shiyoupenhaueru no kenkyuu

Zen no kenkyuu

Settsurumento no kenkyuu

Sakana no kenkyuu

Kan no kenkyuu

Kotowaza no kenkyuu

Kotowaza no kenkyuu

Kou no kenkyuu

Hin no kenkyuu

Semi no kenkyuu

Take no kenkyuu