The World's Strongest Rearguard
What is The World's Strongest Rearguard about (plot, summary)
A burned-out office worker, killed in a bus crash, is reincarnated into a fantasy world and assigned a versatile, unglamorous class called "Rearguard". From the back lines, he acts as the tactical backbone of an all-female adventuring team, utilizing attack, defense, and healing buffs.