Not sure why I did Rio second but here she is. Her new solo is really fun! One of my favorite things about Rio is how her seiyuu's voice acting has evolved but I'm not sure that gets across in music as well as spoken lines.

As far as the song count goes I just counted every song listed on her wiki page, however that doesn't include 99 Nights since it doesn't have a full release. But considering I left out all the anthem songs from the video (and Diamond Days) it seemed fair, idk.

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Sources:
project imas wiki
wilson jj
official imas youtube
matto(P) YouTube出張版 (   • 【ミリシタ】百瀬莉緒「Be My Boy」(楽曲SSR)【ユニットMV】[...  )