Is It Wrong to Try to Pick Up Girls in a Dungeon?, Vol. 5 (manga)

Pursuing his desire to become stronger, adventurer Bell Cranell has become pupil to the brilliant swordswoman Aiz Wallenstein. Though he initially despairs about the vast gulf between their abilities, he gradually begins to improve.
And as he does, a certain goddess's devious plan advances, and with it, a dark shadow approaches. The familia myth--walked by the boy and written by the goddess--continues!