This is a commission as evidenced by the artist's twitter, I can't seem to find the direct second-party source but this seems to be the highest quality version available.
For those not in the know, "Problem Solver 68" is "Benriya 68" in Japanese. The joke of Aru struggling to navigate an English keyboard still would've been fine translating the team name, but with the actual English B's in the dialogue already... (¬_¬)
I like to imagine she's concealing a voluptuous, heaving pair of tiddies, as well as a bangin' body equipped with a pair of beautiful, muscular, Chun-Li-like legs
Based on the theme and time of posting, this is likely a design for Yuki Miku (2024). Haven't found any matching entries though. The artist has a Piapro account but no uploads on it. Considering post #8243229 which is also likely an entry for Yuki Miku (2025), these are probably the artist's own designs. Either they posted it on Piapro and subsequently removed it or they never submitted an actual entry and just drew it for fun.