Kaito starts as actual background noise, the guy nobody notices grinding slimes for lunch money, then one gold drop changes everything. The servants he summons aren't just cool designs, they're real personalities that make you invested in keeping them alive. Most shows about nobodies getting power play it safe; this one lets him stay scrappy, let him fail, let the growth actually cost something instead of feeling inevitable.

Kaito Takagi is a high schooler with poor stats, little more than a background extra. His childhood friend is the most popular girl in class, and he admires her quietly from a distance while he dives into the dungeons that have appeared across Japan, working as a low-level explorer and hunting slimes for spending money. His days are small and unremarkable. Then a golden slime unlike any he has seen appears in front of him. After he defeats it, it leaves behind a legendary and extremely rare servant card, valued in the hundreds of millions, that can summon mythical beings. When Kaito works up his resolve and uses it, a warrior maiden of otherworldly beauty answers the call. What follows is a modern action fantasy about an ordinary explorer getting his chance to rise above the crowd.