Witnessing Immortality in the Body of a Magical Girl

Transmigration + gender swap + building a harem + immortality

Chen Qiu transmigrated to the cultivation world not long ago. After wandering for years, he has only just fully awakened his System, which turns out to be a black-haired, straight-haired little girl.

He later discovers that in this other world, where people cultivate through insects, immortality is impossible. So he transmigrates again, heading to another world to try to attain immortality.