Shinken Sentai Blade Ranger ~Sentouin no Yabou~

Komon Ichirou, an ordinary part-timer, applied for what seemed like a dream job.
What he thought was some kind of amusement park attraction turned out to be a recruitment drive for Earth Jade, a real-life evil secret organization!
Their enemies? The beautiful heroine squad Blade Rangers, protected by a sacred divine sword.
Under the command of the seductive yet ruthless leader, Yamizome Raira, Ichirou is thrown into the grueling life of a lowly combatant in a hyper-exploitative system.
After witnessing the brutal deaths of his fellow combatants—friends he bonded with on the battlefield—Ichirou vows revenge against both the Blade Rangers and Yamizome Raira.

[Translated from dlsite]