I'm not "useless"! I'll prove it by conquering dungeons! Suddenly, magic and dungeons appear in modern Japan, and life has changed completely. I, Midorimu Sakaki, am born with a talent for life magic that cannot be used for exploring dungeons or defeating demons. I was born with a talent for life magic, but while exploring dungeons, I got my hands on a rare item, the "Sage System," which allows me to create new magic...?