mama. new single: “Oyasumi Sekai” Published 2021-05-03 23:16:00 Author kumika Tags auto-generated release MAMA. has released a new single. Oyasumi Sekai (おやすみ世界) was released on May 1st. AmazonCDJapanRarezHutwishlist2021-05-01MAMA.MAMA.Oyasumi Sekaiおやすみ世界Oyasumi Sekai (おやすみ世界)