Uno Mirei began her career under the name Mirei Shinonome (東雲みれい). She debuted in March 2022 as a solo exclusive actress for S1 NO.1 STYLE. Her entry into the industry was driven by a childhood fascination. She has recounted that she first learned about adult content by secretly looking at her father's hidden magazines and later, in high school, became fascinated by the entertainment world after seeing a live performance. In December 2022, she transferred agencies from Forty Four Management to Arrows and changed her stage name to Uno Mirei.
Bagi yang familiar dengan karya Uno Mirei, SONE-314 memiliki kemiripan formula dengan rilisan sebelumnya seperti yang juga mengangkat tema sekolah. Namun, perbedaan terletak pada latar tempat. Jika di SSIS-916 settingnya adalah ruang kelas, maka di SONE-314, latar ruangan kotor pria tua memberikan nuansa "kekotoran" fisik dan psikologis yang lebih kuat. Uno Mirei began her career under the name