Boukensha ni Narenakatta Ore, Skill "Oppai Kyousei" de Nayameru Ano Ko wo Hitodasuke!?

It has been more than ten years since dungeons suddenly appeared on Earth. In a world where those with superior skills become adventurers, Takeshi Miyamoto, a high school boy, awakens with his skill of...... "Breast Correction"? Takeshi is perplexed by this unique ability, which he has never seen or heard of before, but it seems that there are a surprisingly large number of girls who need his particular skill...

(Source: ComicWalker, translated)

Note: The winner of the ComicWalker Manga Award from the 7th Kakuyomu Web Novel Contest.