Rule number one : never love someone from another world 
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the Most I hate is Triangle Loves sh** pls disappear from the world
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Comment by HanaJawa# on Kiss the Abyss - Chapter 70: Return
2 Replies
@HanaJawa# rule number two: if you're the protagonist then love them if they're from another world because of your halo and plot armour 
@Sora Rule number three: If the one that is from another world does not value their life that much, be prepared for lots of self sacrificing attempts (They're the real threat for themselves)