Mendoku SAGA

Swordslinger "Zero Yoshi" was dispatched from the Eden Tower to suppress ghouls and monsters.
He was accompanied by a spellcaster name "Yukari", also tasked with this duty.

Ever the sweet tooth, Zero chased the promise of food.
In the process he and Yukari saved an old woman and child from a monster, but Zero
instantly soured to them and told them to go on their way or he'd abandom them to whatever death awaits.

Yukari was annoyed with Zero for being so violent. They made an odd couple.
They made their way to a village, intending to college some information and go slaying, when...