Attack On Titan: The Warriors of Light and Darkness

Eren Yeager's life is changed forever when two warriors from another universe fall into his. This sparks the beginning of his new life. One forged on blood, fire, trust, friendship and love. But little does he know that the true enemies of humanity are closer than he and anyone else thinks, and that they are a threat even greater than the Titans. Parings, and possible lemons.