I Hid My SSS-Rank Light Power And Let Everyone Think I Was A Useless F-Rank!

What the story is about

After crossing into a monster-ravaged world, Lin Xia spends 18 years waiting for his hidden system to activate. When he awakens publicly as an apparently useless F-rank, the system grants him powerful SSS-rank abilities, which he conceals while growing stronger alongside Jiang Ning, his childhood friend who has returned from a future where humanity nearly fell.