Into the Deepest, Most Unknowable Dungeon manga volume 7 features story and art by Kakeru.

Mere human strength is often not enough to deal with harsh and unyielding dangers—especially if you’re a woman. Yearning for a way she can distinguish herself as an adventurer, Aro devotes herself to engineering and invention, perfecting a new type of arrow the world has never before seen. Meanwhile, fresh from her encounter with Rapier, the Sword Princess Katana decides the time has come to end her adventures and return home. Deeply shaken by their fateful meeting, Rapier now seeks guidance on how to deal with her new rival...