Dorei Yuugi was a pretty interesting manga to read about individuals being captured, their rankings being marked as letters A-E based on their catch rate and strengths, and of the course being used as slaves to kill other slaves ordered by their "masters".

*Spoilers Ahead*

The story was pretty interesting about a young man named Kai, who comes across an online mobile game titled "Go Slave". At first thinking that it was just a game, he spots a male teacher and uses tools from the mobile game to capture him. Seeing that nothing seemed to happen to the teacher, Kai tries to capture a female classmate of his, but decides that it is wrong and ends up running away.

Later that same day, Kai is greeted by a strange man and follows him to a strange building. Entering the room, Kai witnesses the male teacher that he captured, gets killed in front of his very eyes. Moving forward, Kai is forced to play the game by using his own slaves in order to save a female classmate of his. By doing this, Kai promises his slaves that he will free them from this game and himself without killing anymore people.

In the final act of the story, Kai uses his slaves to compete against the current champions slaves in hopes of finally being able to put an end to this game. Both teams have to fight against their opponents while also trying to keep their platform from sinking into the lava as boxes begin to fall onto each of their teams platforms. With the battle becoming more intense by the minute, Kai manages to defeat all five of the champion's slaves one by one. However, Kai's team is struggling to stay alive as his own platform begins to sink into the lava. In an attempt to save his team, Kai's slaves manage to make it out alive.

Unfortunately for Kai, he ends up losing the game and later becomes a slave. Kai screams with frustration as he is no longer able to return to the surface.

I thought that the ending was pretty disappointing and kind of made me feel mad b/c Kai's team ended up staying alive during the final round, but somehow lost their own platform by which means they lose. I honestly wouldn't consider having the platform to still be standing be a rule of the game. As a reader I began to develop a sense of hope for Kai's survival of winning the game. But, I guess the author didn't want me and the other readers of the manga to just simply accept the fact that the main character is supposed to win but instead lose.

Overall, It's an alright manga to read though the cover of the manga speaks for itself about the ending.