It has been announced via twitter that Osiris no Tenbin’s season two will start on April 22, 2016 at 18:00 JST and update each week. The streaming event for the first season, which was held on October 31, 2015, already hinted about the second season. All ten episodes from the first season, which streamed during Summer 2015, are available to watch for free for anyone who has a Fuji TV On Demand (FOD) account.
The guest cast has been announced with some of the character visuals already revealed.
Takahiro Sakurai (Osomatsu-san)
Megumi Han (Ore Monogatari!!)
Daisuke Kishio (Diabolik Lovers: More Blood)
Kenji Hamada (JoJo no Kimyou na Bouken: Diamond wa Kudakenai)
Yuka Komatsu (Naruto: Shippuuden)
Tomo Muranaka (World Trigger)
Ayumu Murase (Haikyuu!!)
Tomokazu Sugita (Gintama°)
Maaya Sakamoto (Arslan Senki (TV))
Eiji Takemoto (Eikoku Ikka, Nihon wo Taberu)
Youji Ueda (Seisen Cerberus: Ryuukoku no Fatalités)
Takaya Kuroda (Future Card Buddyfight DDD)
You Taichi (High School Fleet)
Banjou Ginga (Mobile Suit Gundam: The Origin)
Kenyuu Horiuchi (Garo Movie: Divine Flame)
Megumi Han (Ore Monogatari!!)
Daisuke Kishio (Diabolik Lovers: More Blood)
Kenji Hamada (JoJo no Kimyou na Bouken: Diamond wa Kudakenai)
Yuka Komatsu (Naruto: Shippuuden)
Tomo Muranaka (World Trigger)
Ayumu Murase (Haikyuu!!)
Tomokazu Sugita (Gintama°)
Maaya Sakamoto (Arslan Senki (TV))
Eiji Takemoto (Eikoku Ikka, Nihon wo Taberu)
Youji Ueda (Seisen Cerberus: Ryuukoku no Fatalités)
Takaya Kuroda (Future Card Buddyfight DDD)
You Taichi (High School Fleet)
Banjou Ginga (Mobile Suit Gundam: The Origin)
Kenyuu Horiuchi (Garo Movie: Divine Flame)
Osiris no Tenbin is a five-minute episode series that Fuji TV first added for FOD service. Yuki Kaji voices the assassin of the series, who talks to the targets before killing them using his supernatural power in each episode.
Official site: http://fod.fujitv.co.jp/s/genre/anime/ser5383/
Source: Official Twitter
Osiris no Tenbin 2nd Season on MAL
