I recall how my own efforts were in vain is the 59th episode of Chihayafuru.
Tension grows between Hisashi Suo and Shinobu Wakamiya, as Chihaya is depressed on her school trip. Michiru Horikawa comments on Chihaya's absentmindedness, and Chihaya apologizes and decides to have fun with her classmates.
Taichi Mashima struggles in his matches and ultimately ends up losing, dashing his hopes of becoming a Master. He leaves to collect himself before returning to watch the final matches.
Poems of the Episode
In order of appearance: