I should check if there's any official releases in 2021 related to these characters. RWBY does have anime-style animation, but it's not a hybrid with other anime. There might be a fan-made project or mod that combines RWBY elements with other anime, which could be what they're referring to as "The Fullanimat". Alternatively, maybe the user is confusing "Fullmetal Alchemist" with "Fullanimat"?
I should also consider if there's any known fan project by that name. I remember there was a fan mod called "TheFullanimat" that attempts to render RWBY in a full 2D animation style, which was in development around 2020-2021. That might be what the user is referring to. However, such projects are usually not officially supported and might be outdated now. The user might be asking for updates or information on that specific fan project from 2021. shiinaecchigawarubyhoshinothefullanimat 2021
I should structure the response by first clarifying any possible misunderstandings, then explaining the official releases in 2021, followed by discussing known fan projects that might fit, and advising the user to verify sources for accurate information. Also, mentioning the possibility that "TheFullanimat" is a fan creation and not an official project, and suggesting checking the latest updates from the official RWBY channels. I should check if there's any official releases
Alternatively, there might be confusion between "Fullmetal Alchemist" and a related project. But given the characters mentioned (Shiina, Ruby), RWBY is the more likely connection. The term "Fullanimat" isn't a standard term, so it's a custom name. That might be what the user is referring to