[2][3] Kubo was one of the pioneers of otorhinolaryngology in Japan, and was selected as a representative of his country for the first International Congress of Oto-Rhino-Laryngology at Copenhagen (1913).

[citation needed] Kubo was famous for his Haiku (俳句)- and Waka (和歌)-poetry, started as a pupil of Kyoshi Takahama.

As a poet he found a mentor in Naobumi Ochiai, with Saishu Onoe formed Ikazuchi kai, and created friendship with Byakuren Yanagihara.

In February 1913, Kubo began publishing a magazine "Enigma" (『エニグマ』)[4] for his circle of poets and haiku.

It was in its May issue that Byakuren Yanagihara contributed her work "Hitou" (『緋桃』) (Himomo, peach flowers in bright pink), and in the same issue, Kubo and his wife also published their workes as well; Inokichi "Aruto Haideruberuku ni tsuite" (『「アルトハイデルベルク」に就いて』) (Thinking about 'Alt-Heidelberg') and Yorie "Tsukushi kudari" (『筑紫下り』) (Sailing down Tsukushi river).