Arifureta Shokugyou de Sekai Saikyou

Synopsis

Hajime is convinced to fight when Aiko asks him to. He erects barricades around the village while avoiding the amorous intentions of Tio who finds his mixture of neglect and verbal abuse exciting. Hajime decides to dedicate their victory to "Aiko, Goddess of Plenty", embarrassing her, then proceeds to massacre the monster army with transmuted mini-guns and rocket launchers. With his ammunition depleted and Yue and Tio out of magic Hajime and Shea rush to capture the mysterious robed commander as the monsters retreat. Hajime realises the commander is the missing Shimizu. Shimizu admits he was disappointed not to be the only summoned Hero, especially as he paled in comparison to his more powerful classmates, so he signed a contract with a demon, power in exchange for killing Aiko. He scratches Aiko with a poisonous needle but is shot from behind by a monster sniper. Hajime shoots the sniper and heals Aiko with Ambrosia via a kiss. As Shimizu lies dying he offers loyalty to Hajime who spots the lie in his eyes and mercilessly executes him, devastating Aiko. As they leave Yue correctly guesses the sniper was aiming at Aiko, so Hajime finished killing Shimizu so Aiko would blame him and not herself, enabling her to recover much quicker psychologically.

(Source: Wikipedia)