Jan 19, · Yasashii Ryuu no Koroshikata summary: MangaSim is the read manga online website with a huge number of manga being updated daily and high-speed. Read manga online, Manga online, Read manga and many more.. Current Time is Apr AM. Hot Link; Goblin Slayer Manga;5/5(16). Nov 19, · Read Yasashii Ryuu no Koroshikata Manga Online. The world is said to exist with yang, the world of humans and yin, the world of mythical beasts in conflict with each other. A long time ago, two clans who were involved in an unending war exchanged an inviolable pledge and started living in their own worlds. Yasashii Ryuu no Koroshikata summary: In this fantasy world, humans and phantoms live side by side. One represents Yang and the other represents Yin. A long time ago, when the world faced apocalypse, the King of the phantoms helped the Queen of the humans and made a promise to his beloved Queen that whenever her descendants faced a similar 5/5(16).