Funimation just streams the official trailer of How NOT to Summon a Demon Lord Ω (Season 2) on Monday. The company has dubbed the first season in English and it is available on the Funimation site. The second season will be released sometime this spring 2021 as it aired in Japan a day after tomorrow.
Update 2: Funimation recently announced on Monday to stream How NOT to Summon a Demon Lord Ω (2nd Season), English Dub. The anime TV series will premiere on April 8, 2021.