I Became A Genius At The Academy Using My Skills

37-year-old me, living a failed life, meet 17-year-old me, who knows no failure.

What connected us?

An SSS-rank skill — Time-Linked Phone

【You have encountered yourself 20 years in the future.】
【The future will drastically change.】
【Your job will be upgraded to a salesman.】
【Your residence will be upgraded to a semi-basement studio apartment.】

A future that constantly shifts.

A deadline of 3 years.

Only 6 hours of calls allowed per day.

I will become the strongest in the world.