From reverse-search in Yandex, link led to Pinterest but the pin I saw has lower file size https://ph.pinterest.com/pin/949978115168846883/

OG source (don't work): https://x.com/spicythelame/status/1627946045400395778

Used in Rin's schedule once here: https://x.com/RinPenrose/status/1629938077945790464