Saga Planets (サガプラネッツ, Saga Puranettsu) (often stylized as SAGA PLANETS), is a Japanese adult visual novel brand and a formerly subsidiary of Visual Arts. Their debut title, Mukuro ~Mesu o Nerau Agito~, was released in 1998 and their most recent work, AMBITIOUS MISSION, was released in 2022. Among Saga Planets' most notable releases is the Four Seasons Series (四季シリーズ, Shiki Shirīzu): Coming x Humming!! (representing spring), Natsuyume Nagisa (representing summer), Kisaragi Gold ★ Star (representing autumn), and Hatsuyuki Sakura (representing winter). Source: Wikipedia (en)