Imperial Saga (インペリアル サガ) is a game in the SaGa series released by Square Enix in 2015. It is unique among the rest of the SaGa series due to it being on the PC rather than consoles or handheld games like previous installments. There are no plans for a western release.
Imperial SaGa is a online browser game. Upon choosing your character, you can choose from various places on the map to visit, being able to meet various characters from the previous SaGa games which can join your party. Battles are very similar to Romancing SaGa 3.
Emperors SaGa Collab.: An opportunity to get level 3.4 Selma via passcode.
7 Heroes vs 7 Heroes Event: An opportunity to fight The 7 Heroes and get level 2 and 3.4 of their human forms.
Arslan Senki Collab.: An opportunity to fight undead monsters and get level 3.4, 4 and 5 Arslan characters.
Four Heavenly Kings Event: An opportunity to fight the 4 Heavenly Kings and get level 3.4 Barbara(Bow), Jamil(Axe), Hawke(Foil?) and Claudia(Martial).
Attack on Titan Collab.: An opportunity to fight titans and get level 3.4, 4 and 5 Attack on Titan characters
7 Heroes vs 7 Heroes Event: After defeating the 7 Heroes with 10 Stars, you can fight their merged form.
Four Heavenly Kings Event: After defeating the Four Heavenly Kings with 10 stars, you can fight Saruin.
Challenges of Elore: Ten battles with monsters without rest with increasing difficulty.
Lords of Vermillion Arena Collab.: An opportunity to get level 3.4/5 Alice, Miria and Dark Alice via passcodes and the Barracks.Also, you could get Adel, Lazareth and Iris in LoVA.
Giant Dragon Dora: An opportunity to fight Green Dragon and get level 3.4 Michael(Sword).
Challenges of Nisa: Ten battles with monsters without rest with increasing difficulty.
Four Noble Demons Event: An opportunity to fight the 4 Noble Demons and get 3.4 Julian(Epee), Sara(Hammer), Thomas(?) and Ellen(Spear).
Challenges of Yucomb: Ten battles with monsters without rest with increasing difficulty.
Kujinshi Event: An opportunity to fight Kujinshi and get level 3.4 Gerard(Foil).
Tiny Feather Event: An opportunity to fight Tiny Feather and get level 3.4 Neidhart(Bow).
Gradius Dispatching, mysterious disappearance: An opportunity to fight Kylin and get level 3.4 Rouge.
Challenges of Cyril: Ten battles with monsters without rest with increased difficulty.
Final Fantasy Brave Exvius Collab.: An opportunity to get Level 3.4 and 5 Rein, Fina and Roswell via passcodes or in the Barracks.Also, in FFBE, you can get Adel and transform him into Lazareth,Iris,Ivan,Olga or Finnith, and fight The Seven Heroes.
Valentine Event: An oportunity to fight Black Dragon Ruler and get Event Professor.Also, you can get Love Orbs and Hearts to exchange for items.
Megalith Appearance: An opportunity to fight Tree and Beast Lords and get Event Nebelstern(Axe).
Treasure Huntimng in Ligau Isle! : An opportunity to fight Flame Tyrant and get Event Aisha(Sword).
Challenges of Eres: Ten battles against monsters with increased difficulty.
Eleanor SOS! : An opportunity o fight Tone and Stone Lords and get Event Cordelia.