the source is third party but it's the same image from an official source https://www.melonbooks.co.jp/detail/detail.php?product_id=809162 but it's bigger and the same size as https://www.bugbug.news/anime/46741/ but it's better quality

i'm pretty sure it was part of an official PV but i can't find the original source. not sure if this qualifies as anime screenshot or stitched since it comes from the the anime maker themselves, if anime adaptation is derivative work and if i tag this with the manga artist satou kuuki or with the studio t-rex