Back to the Past

Ryouma Takeguchi, a famous historian who dreams of time travel, realizes that his dream comes true. Waking up in the past, Ryouma found himself in confusion as he met Nikola Tesla, the famous inventor from the 18th century. Turns out, He needs help from Ryouma to correct the history. He claimed that there's something wrong with his era. And together, they will find what causes the alteration of the future and fix it for the sake of humanity.