The Unfortunate 'Trapper' Cast Out of the Hero’s Party Will Defy Fate and Become the Strongest with the Unique Skill 'Arrow'New勇者パーティから追い出された不遇職【罠士】、ユニークスキル【矢印】で最強になる【電子単行本版】; Yuusha Pati kara Oidasareta Fuguushoku 【Wanashi】Yunikku Sukiru【Yajirushi】 de Saikyou ni Naru

From Google Translate: "So I've decided that you... will leave the party as of today." 40 years have passed since dungeons appeared all over the world. Keiichirou, a member of an S-class adventurer party, is kicked out by his childhood friend for not being strong enough. His job as a [Trapper] is a bad job because he cannot attack first. Keiichirou, who was in despair after his life as an adventurer was cut short, meets a mysterious girl and is given a unique skill...!? That skill is [Arrow] -- the strongest skill that overcomes the weaknesses of the [Trapper] class. Keiichirou begins his journey as an adventurer once again, aiming to become the strongest!