Chiaki Mayumura

is a Japanese idol singer and songwriter currently associated with Toy's Factory. She has released five major albums charting on Oricon's Top 100. She calls herself a “track maker idol with playing guitar”. She is also the chairperson of Kaishaja Naimon Co., Ltd (Not Company). Fans call her Chi-chan.

Biography Since Chiaki's father was from Okinawa, Japan, she liked to sing Okinawan music and dance to it in her childhood. She was influenced by South Korean pop group TVXQ, and originally dreamed of being a singer in 8th grade.

Though initially having plans to enter nursing school after graduation, she was further influenced by South Korean singer BoA, and ultimately decided to study music instead.

At the recommendation of a vocal instructor, she joined the (defunct as of July 2016) idol group Star-Bright★REX under the name Chiaki (Chī-chan).

On February 11, 2016, she began her solo career as Chiaki Mayumura (眉村ちあき), writing her own songs and holding concerts. At first, she sang with karaoke accompaniment, however, transitioned to acoustic guitar one month later.

On December 22, 2017, she held a press conference in Karasuyama Community Center, Tokyo, and she announced she registered and founded “Kaishaja Naimon Co., Ltd”. Since then, share certificates have been sold at her concerts.

On June 10, 2018, she appeared on a Japanese television program known as God Tongue (Goddotan・ゴッドタン), where she ad-libbed a song about vomit called Gero (ゲロ).

A staff member of Toy's Factory, a Japanese record label, was impressed by her performance. Under Toy's Factory, she released her debut album, "Mejameja Monja" on May 7, 2019.

Discography Albums + List of albums, with selected chart positions Title Information Oriconpeakposition Released: March 2016 Label: none — Hipar Saiyan Chi Released: March 18, 2016 Label: none — Released: November 2016 Label: none — Released: August 5, 2017 Label: none — Released: August 5, 2017 Label: none — Released: October 26, 2017 Label: none — Released: November 2, 2017 Label: none — Germanium Released: January 4, 2018 Label: none — Released: May 25, 2018 Label: Label Janaimon Catalog No.: LJNM-0004 Re-recordings of Germanium, Norijiru and Hatachi no Onna obu Amerika — Released: January 9, 2019 Label: Label Janaimon Catalog No.: QZCT-1004 Compilations of her previous releases 41Released: April 14, 2021 Label: Toy's Factory Catalog No.: TFCC-86751 Re-released by Toy's Factory as a major-label album Released: May 7, 2019 Label: Toy's Factory Catalog No.: TFCC-86657 45 Released: January 8, 2020 Label: Toy's Factory Catalog No.: TFCC-86697 (Limited Edition), TFCC-86698 (Regular Edition) 21 Released: December 9, 2020 Label: Toy's Factory Catalog No.: TFCC-86729 (Limited Edition), TFCC-86730 (Regular Edition) 57 ima Released: February 23, 2022 Label: Toy's Factory Catalog No.: TFCC-86822 (Limited Edition), TFCC-86824 (Regular Edition) 52 Released: February 23, 2022 Label: Toy's Factory Digital download only — SAI Released: May 7, 2023 Label: Toy's Factory Catalog no.: TFCC-81009 44 Released: November 27, 2024 Label: Toy's Factory Catalog no.: TFCC-81098 — Ampland Plan Released: April 15, 2026 Label: Toy's Factory Catalog no.: TFCC-81191 36

Singles (Digital download only) Title Information Released: June 25, 2018 Released: June 25, 2018 Released: July 8, 2018 Released: September 1, 2018 Released: September 1, 2018 Released: November 15, 2018 Released: June 5, 2020 Released: June 30, 2020 Released: July 22, 2020 Released: August 28, 2020 Released: September 18, 2020 Released: April 14, 2021 Individual Released: July 7, 2021 Released: August 4, 2021 Released: September 12, 2021 Released: September 18, 2021 Released: October 24, 2021 Released: February 9, 2022 Released: May 30, 2022 Released: December 15, 2022 Released: December 15, 2022 Released: January 23, 2023 Released: February 9, 2024 Released: May 31, 2025

EPs (Digital download only) Title Information Released: July 7, 2022 Released: April 17, 2024

DVD/Blu-ray Title Information Released: October 20, 2021 Catalog No.: TFXQ-78187 Released: December 3, 2021 Catalog No.: OED-10803

Filmography + Title Year Role 2019 2019 2021 2024