Skill ga Nakereba Level wo Ageru: 99 ga Counter Stop no Sekai de Level 800 Man kara Start

At the age of 14, Ryuya is the only one who cannot gain skills and is abandoned by her orphan friends. After five years of hellish training, he reached level 8 million, and now that he has no enemies, he knocks on the gates of the guild to become the adventurer he admires...