He participates in the Summer Troupe as a costume specialist and actor. He may look feminine, but that is only because he wears any cute clothes he likes. On the inside, he is fully male. However, his personality is rather frank and brazen, and he often goes off at his seniors. The gap between his personality and his looks are steep. After he did the costumes for the Spring Troupe's play, Izumi decided to invite him to the summer audition. Soon following, Yuki became a part of the Mankai Company ensemble.
