Ninja Gaiden Ragebound is a tightly packed action game that comes with 3 endings, namely ending A, ending B, and secret ending. To get all three endings, players need to complete all the levels in both regular and hard difficulty settings.
I have compiled a guide to help you unlock all 3 endings in Ninja Gaiden Ragebound. I have also included a tip that can help you become undefeatable in the game and get done with all the endings rather quickly.
Here is how you can unlock each ending in Ninja Gaiden Ragebound.
Ninja Gaiden Ragebound: Unlock Ending A

You can unlock ending A only after you defeat the boss in level 4-6 (Into the Shadows) when playing on regular difficulty mode. At this point, players are required to make a choice. Pick Kumori when asked, “Who will escape Hell and seal the door?”
When you finish the game with Ending A, you will get the Venom achievement or trophy as a reward.
Ninja Gaiden Ragebound: Unlock Ending B

Defeat the boss in level 4-6 with the regular difficulty mode and pick Kenji when prompted, “Who will escape Hell and seal the door?”
Complete the level to unlock ending B, and you will be rewarded with the Inner Peace achievement.
Ninja Gaiden Ragebound: Unlock Secret True Ending

Ending A and ending B are quite simple to unlock, but the secret ending takes some time. First, you will have to finish the game while playing at regular difficulty settings to unlock the hard mode.
Now select hard mode and finish the game. The secret ending requires players to beat the 5-1 level (Endless Struggle). You will come across the hard versions of all the bosses, and it is not that easy to beat them. Playing with Kumori is a better option because she deals more damage than Kenji.
The secret ending is unlocked after defeating all the bosses. Players are rewarded with the Endless Struggle achievement. That’s not all. Unlocking the secret ending also rewards players with an additional costume for each character. Kenji gets a Mugen Tenshin Ninja Costume, while Kumori receives a Runaway Ninja Costume.
If you change the character, you will get a different visual at each ending. However, the reward at each ending is the same.
Helpful Tip: Ninja Gaiden Ragebound lets players enable Assist Mode, which makes you invincible. You can set the damage from enemies to 0%. The best part about the Assist Mode is that you still get all the trophies and achievements.
