**Hometown:** Tokyo
**Height:** 154 cm

Subaru is a lively baseball fan in possession of lots of stamina and will sometimes even incorporate baseball terminology into her speech while discussing matters completely unrelated to the sport. Subaru ended up being scouted as an idol when she met the producer, after almost accidentally hitting them with a foul ball in the middle of her training. At first however, the producer actually assumes that she's a boy, mainly due to Subaru's tendency to use more commonly masculine aligned language, such as referring to herself using "ore" rather than the common "watashi". 

Very outgoing and friendly - she helps the more reserved idols (such as Roco) with socialising and likes to see them have fun, ensuring they feel included in activities. Anytime Subaru gets nervous, she likes to head out and play some baseball, or even just move around a little as it usually clears her head and helps her relax.

Subaru tends to fawn over others girls a lot, often admiring how cute and amazing girls can be despite also being a girl herself. One of the most common subjects of her admiration tends to be Yuriko; Subaru has been motivated by her performances and personality a number of times, leading to the two of them being seen together a lot despite their contrasting interests. However, Subaru can also talk rather negatively about herself when she notes how cute the girls around her are and claims that she would just "get in the way".

PV made for THE IDOLM@STER Million Live!'s 4th Anniversary.

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Animated music video for the song Seven Count by MILLIONSTARS. Serves as an anime prologue image music video for The IDOLM@STER Million: Live! revealed during the AnimeJapan 2022 event. This prologue stars Mirai Kasuga, who dreams and envisions a future of being an idol.

Manga adaptation of "THE IDOLM@STER Million Live! Theater Days" smartphone rhythm game, focusing on Yuriko Nanao, Momoko Suou and Konomi Baba.
 
Note: Chapter count includes prologue, one 0.5 chapter, three Christmas specials, and six volume omake chapters.

Animated PV of the song "Dreaming!" from THE iDOLM@STER Million Live!, included with the first limited edition of the single "THE IDOLM@STER LIVE THE@TER DREAMERS 01 Dreaming!"

Mirai Kasuga, who wants to carry on a dream she has yet to see. Shizuka Mogami, who yearns to be an idol and is shaken. Tsubasa Ibuki, who does not know what she can be serious about. 
 
At 765 Production new idols gather and everyone's "dreams" will brought into brilliance at the theater! The long-awaited anime of "The IDOLM@STER Million Live!! 
(Source: Official Site, translated)

A new episode included in volume 3 of the Blu-ray release depicting behind-the-scenes footage of the opening performance

Subaru Nagayoshi