LINE 血之聖約 is a free-to-play strategy game developed by LINE Corporation for Android users. It is based on a well-known IP and takes place in a world that is based on the real world but includes all kinds of supernatural creatures. The game features a modern legend of fantasy races that exist in human society.

The game has a simple interface and is easy to learn. It features an innovative screen-swipe control mode that allows players to control the game with their fingertips. The game combines card strategy with team building and offers a unique and exciting "sound-action" battle experience.

However, it should be noted that this game is rated 12+ due to its violent content and characters wearing revealing clothing. Some game content requires additional payments. It is also important to avoid getting addicted to the game. LINE Corporation is the authorized operator of the game in Taiwan.