Japanese publisher Hakusensha announced today (18) that the novel I'm a Behemoth , an S-Ranked Monster, but Mistaken for a Cat, I Live as an Elf Girl's Pet (S Rank Monster no “Behemoth” dakedo, Neko to Machigawarete Elf Musume no Pet Toshite Kurashitemasu ) by Nozomi Ginyoku will be adapted into an anime.
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I'm a Behemoth novel gets anime adaptation

Dubbing cast in Japan:
- Tasuku Hatanaka as Tama
- Riho Sugiyama as Tama
- Hinaki Yano as Aria
Synopsis:
After perishing in battle against evil forces, a warrior is reborn as one of the world's most formidable monsters: a behemoth! However, his journey to achieving his true strength is hampered by the fact that, in baby behemoth form, he resembles... a house cat?! When an intrepid elf decides to take him in, she soon realizes that she may need his help as much as he needs hers!
Therefore, I'm a Behemoth was published in Shōsetsuka ni Narō ( Let's Become Novelists ) in August 2017. Additionally, a manga adaptation by Tarō Shinonome debuted in March 2018.
Source: Official Website