Tsukudani's editor suggested making Kaguya the protagonist of the spin-off manga Himegoto+, and she wanted to give Kaguya a partner, so she created No. 1 and thought she might as well make her into a cross-dressing girl.
Tsukudanis redaktør foreslog at gøre Kaguya til hovedperson i spin-off serien Himegoto+, og hun ønskede at give Kaguya en partner, så hun skabte No. 1 og tænkte, at hun lige så godt kunne gøre hende til en crossdressende pige.