• Start a New Game by clicking the first option in main menu.
  
• Click the first girl and choose the bottom difficulty: 因难模式.
  
• Hold Ctrl key to skip dialogue.
  
• During the conversation, choose the first option: 便替姐姐洗衣做饭.
  
• Win the level and destroy all weak points:

• Click the right option upon completion: 继续游戏.
  
• Press Spacebar to auto-skip dialogue.

• Click the second girl and choose the top difficulty: 普通模式.
  
• During the conversation, choose the second option: 我与你拼了.
  
• Win the level and click the right option upon completion: 继续游戏.

• Click the third girl and choose the bottom difficulty: 因难模式.
  
• During the conversation, choose the first option: 奉承眼前这位影卫.
  
• Win the level and destroy all weak points.

• Click the right option upon completion: 继续游戏.

• Click the fourth girl and choose the top difficulty: 普通模式.
  
• Win the level and click the right option upon completion: 继续游戏.

: This is probably the hardest level in the game; be aware of invisible projectiles and quickly cover the bottom section of the screen (hold LMB and drag the mouse left and right) whenever you see a ghost trail.

• During the conversation, choose the first option: 独自去找吃食。

• Click the fifth girl and choose the top difficulty: 普通模式.
  
• Win the level: press RMB and switch to the 5th knife.
  
• Click the right option upon completion: 继续游戏.

• Click the sixth girl and choose the bottom difficulty: 因难模式.
  
• Win the level and destroy all weak points.
  
• Use the 5th knife, destroy blue orbs to heal, and avoid fire orbs to prevent extra damage.

• Click the right option upon completion: 继续游戏.
  
• During the conversation, choose the first option during the outro: 我只愿守护我的圣殿骑士.

• Replay the fourth girl and choose the top difficulty: 普通模式.
  
• Win the level: press RMB and switch to the 5th knife.
  
• Click the right option upon completion: 继续游戏.
  
• During the conversation, choose the second option: 一同下山找吃食。

• You should already have the following achievement by now.
  
• If you don't, simply die in any level to get it.