Mannen F Rank "Tsuuyaku" Skill-mochi Teihen Boukensha, Ishuzoku no Saikyou Bishoujo-tachi to Party wo Kunde Sainou ni Kaika shi Musou suru

Zenon is a boy with only the useless "Interpreter" skill, and he's stuck at the bottom of F rank, unable to get promoted. He's ridiculed by those around him, and he spends his days doing uninspiring jobs to earn a living. But one day, Zenon's fate takes a dramatic turn when he's selected to be a support member for a group of beautiful S-rank adventurers! What was thought to be a useless skill, "Interpreter," becomes an indispensable ability for S-rank adventurers of different races. With the true power of the "Interpreter" skill, he can even transform the techniques and skills of the top S-rank adventurers into his own abilities. Zenon's strength improves dramatically, and he rises through the ranks. As he goes about his daily life, he starts to be relied upon for things other than interpreting... "We can't live without you!"

(Source: Square Enix, translated)