A Condition Called Love [Tokyo Revengers]

Two middle school gangs wrapped in a turf war lead to the murder of an innocent person; a 26-year-old man named Takemichi Hanagaki has the power to prevent it all, by altering the flow of time and changing the course of the future. At the height of his rock-bottom life, not only does he have to time-leap twelve years back and save that innocent person who happens to be his ex-girlfriend from middle school, but also along the way he has to change the life he spent running away and must aim for the top of Kanto's most sinister delinquent gang, The Tokyo Manji Gang.
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[Shinichiro Sano X OC X Keisuke Baji X Manjiro Sano]