The Cursed Sword Master's Harem Life: By the Sword, for the Sword Vol. 3 -

Guided by a sword that can turn into a beautiful woman, Sojiro and Sistina train in an enchanted tower to hone their monster-hunting skills. However, all their training causes the monsters within to grow stronger! With people now stranded inside, they'll need to form a group to stage a daring rescue. And as if facing stronger foes isn't enough, Sojiro's beloved sword Sakura is stolen, and the tower's master appears! Is Sojiro's magical journey to another world about to come to an abrupt end?!