DE DE MOUSE and YonYon's superb collaboration single has been analogized! Sparkling disco beats, synth sounds reminiscent of the spring breeze, YonYon's gorgeous singing voice, and the story she writes are a song that pushes the back of someone who 'want to be yourself'! The third collaboration single analogue by DE DE MOUSE is 'Step in Step in' with YonYon, a singer-songwriter born in Seoul and raised in Tokyo, a music producer, and a radio personality. DE DE MOUSE will make 'superb pops/city pop', continuing from the previous work 'Neon Light no Yoru feat. Hijusanjuichi', which was a collaboration with British producer TANUKI, and the previous work 'Midnight Dew', which was a collaboration with Punipuni Denki. Based on the concept of ', this song was created with the theme of 'I want to be beautiful all the time', which is hidden in every girl's heart. The gorgeous singing voice and the story she writes are finished in a song that pushes the back of someone who 'want to be yourself'. The B-side contains a Dance Mix by DE DE MOUSE. The jacket was created by illustrator Akira Komayama.