What Happened to Wholesale a Few Zanpakutō!

The 18-year-old An Ran has just awakened as a superpower, but he is a loser with no superpowers and an F-level potential. He also just lost his sisters and aunt who raised him. Until the supernatural beast broke into the house and wanted to eat the souls of the sisters, he obtained a "Zanpakutō" in a crisis, exploded the supernatural beast with one blow, and stabbed the two sisters - actually resurrecting them who were about to disappear, and turned them into practicing shinigami! But trouble also comes: An Ran himself can't use the Zanpakutō's advanced abilities. If he wants to make a new sword, he must first purify his soul; the sisters must unlock the "first solution" of the Zanpakutō to be considered a real death god; they also have to hide from the security bureau. After all, if a living person suddenly "resurrects" and is captured for research, it's over. In this way, the good-for-nothing boy was forced to start the "Death God Development Plan"!