Need to verify some details since I haven't played the game. The title in English is definitely "If You Die, My Wife Will Be Your Enemy!" or sometimes referred to as "Tsuma ni Damatte, Sokubaikai ni Ikun ja Nakatta Install." Confirm that the Demon-Slaying Blade is the correct term, maybe check if the game's weapon has a specific Japanese name. But since the guide is in English, using the translated name is okay.
Include screenshots or visual references? Since it's a text guide, maybe not, but describe key scenes or dialogue options that are critical. tsuma ni damatte sokubaikai ni ikun ja nakatta install
Also, some gameplay tips: exploring all options in dialogue, using the Demon-Slaying Blade strategically, checking the bestiary for demon weaknesses, and using save points to test different choices. Need to verify some details since I haven't played the game
Wait, should I mention the different difficulty levels or modes? I don't recall there being difficulty settings in visual novels. Maybe it's just the default progression. Also, there might be hidden content or achievements that require specific choices. Maybe include that. Include screenshots or visual references
Possible errors to avoid: mislabeling the endings, confusing the choices. Make sure each decision point is clearly explained with the immediate effect and the longer-term consequences.
Next, the story synopsis. The protagonist, Shuji, dies and is given a chance to save his wife from the demon. He uses the sword to fight the demon. The wife, Misaki, becomes the demon's vessel. Important to mention the multiple endings based on choices.