At the Cost of Time

"I want to be a multimillionaire." "I want your 60 years." "Forget it." … "I want power, enough power to defeat him." "20 Years." "Okay, deal." A young boy who has always been timid picked up a black box under the guidance of a strange cat. This is a black box that can make wishes, as long as you can fulfill it. Strength, height... With his wish, the whole world is undergoing bizarre changes, and people from different worlds meet together. When he turned around and found out, he was already lying in a pool of blood, and he even cut his beloved's throat with his own hands! He could only make a wish again, wishing to save her, but the price was an impossible task - correcting the world lines of the seven worlds. He agreed. He was reborn in a different world and started fighting again with a mission. He wanted to pull her out of the gears of fate with his own hands. Even at the expense of yourself.