The Slave's Adventure

NOTICE: *UPDATE EVERY FRIDAY/SATURDAY* A world where the weak can become strong has been created. The Power is the system that makes the weaker gets stronger, but will they get a happy ending in that world, or will the weak continue to be oppressed by those with higher status? Kanatsumi Tendou's story is proof that this world exists. But unfortunately, his world remains unchanged when he is made a slave by the person who summoned him to a different realm from earth. At this rate, Tendou would only be able to resign himself to this heartbreaking life. But... Who is he and what is his purpose to summon Tendou? What will happen to Tendou?