1. Albums
2. "M" letter soundtracks
3. Manatsu no Dia☆ / Rio Momose (CV. Rikako Yamaguchi), Yukiho Hagiwara (CV. Azumi Asakura), Kotoha Tanaka (CV. Risa Taneda), Mami Futami (CV. Asami Shimoda)

Manatsu no Dia☆ / Rio Momose (CV. Rikako Yamaguchi), Yukiho Hagiwara (CV. Azumi Asakura), Kotoha Tanaka (CV. Risa Taneda), Mami Futami (CV. Asami Shimoda)
THE IDOLM@STER MILLION LIVE! THEATER DAYS
真夏のダイヤ☆ / 百瀬莉緒 (CV.山口立花子)、萩原雪歩 (CV.浅倉杏美)、田中琴葉 (CV.種田梨沙)、双海真美 (CV.下田麻美)

Manatsu no Dia☆ / Rio Momose (CV. Rikako Yamaguchi), Yukiho Hagiwara (CV. Azumi Asakura), Kotoha Tanaka (CV. Risa Taneda), Mami Futami (CV. Asami Shimoda)

Composed by	Seiji Miura
Arranged by	Seiji Miura
Published by	Lantis
Catalog number	LZC-1939
Release type	Game Soundtrack - Official Release
Format	1 Digital - 1 tracks
Release date	August 28, 2021
Duration	00:03:50
Genres