Marcey Naito is a Japanese manga artist, born on April 21, 1991, and originating from Kyoto Prefecture. Naito began their professional career in 2017 after winning the 98th Weekly Shōnen Magazine Newcomer Special Encouragement Award for the one-shot Kyou mo kyoto te. In the same year, they also received an honorable mention for another short work, Geijutsu sensei shon!. Naito continued to develop their craft, and in 2019, their one-shot Ame to Issho ni won the Jump Rookie! award for the month of November. Before achieving serialization, Naito gained industry experience as an assistant to Negi Haruba, the creator of the popular harem manga The Quintessential Quintuplets.

Marcey Naito is the creator of the manga series Tying the Knot with an Amagami Sister. The story, which follows a studious high school boy who must marry one of three shrine maiden sisters to secure his new home, was initially published as a one-shot in Kodansha's Weekly Shōnen Magazine on December 2, 2020. The one-shot was part of a reader poll competition, and after receiving the most votes, it was greenlit for serialization. The series began its regular run in the same magazine on April 21, 2021, and as of March 2025, Kodansha has compiled its chapters into nineteen tankōbon volumes. The manga is licensed for English release in North America by Kodansha USA, representing Naito's first work to be published in English. Tying the Knot with an Amagami Sister has been adapted into an anime television series produced by the studio Drive, which aired for 24 episodes from October 2024 to March 2025.

While primarily a manga author, Naito has a minor but documented credit in voice acting, providing the voice for a cat in the anime adaptation of Tying the Knot with an Amagami Sister. As an artist, Naito's work is situated within the shōnen demographic and is recognized for its harem and romantic comedy elements, a genre lineage that connects back to their time as an assistant on a landmark series in the same category.