I Became A Genius At The Academy Using My Skills

A 37-year-old guy living a failed life, meets 17-year-old self through a SSS Rank skill. 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. —— If you like weak to strong, Academy and time travel stuff then I highly recommend this. ——-