While most players play using portrait mode, there are some folks that like the full Landscape view as it is better during battles since you can actually see incoming attacks on your other units and whether they need to take cover. The process in doing so is very simple.
Thanks to FG3000, he showed us the way to this mode easily.
Step 1: Download LD Player 9
Step 2: Go to LD Store and Download Nikke Goddess of Victory
Step 3: Go to [Settings] on the Top Right Corner of the LD Player (A 3 Stripe Icon)
Step 4: Go To [Model] Tab – Select 120 FPS
Step 5: Go to [Game Settings] tab and check “Enable High Framerate”
Step 6: Go to [Other Settings] tab and pick “Forcibly lock landscape” option
And that will be it. Do keep in mind that players have reported that some dialogues are cut off in those mode. It may or may not happen to you.
Either way, enjoy Nikke: Goddess of Victory in 120FPS no lag landscape mode!