1) Sekai (????) is a Japanese cover artist who mainly covers vocaloid music. 2) SEKAI (星界) is a Japanese CeVIO developed by KAMITSUBAKI STUDIO. SEKAI was released on April 29, 2022. SEKAI was voiced by ヰ世界情緒 (Isekaijoucho). 2) Sekai is a Portuguese producer/singer/songwriter who, in his words, produces "melodic EDM Housemidtempostep happy inspirational feels stuff". Loaded up with coffee and cookies, He tries to tell a story through his music and conveys various emotions through his harmonious progressions and emotional lyrics. Definitely an artist whose songs should easily get stuck in your head. 3) Sekai Collective is an electronic music label. See https://sekaicollective.bandcamp.com/ 4) Sekai is also a Japanese name (e.g. Sekai Saionji, a character in the anime School Days)