无职转生~在异世界认真地活下去~ (Mushoku Tensei - Isekai Ittara Honki Dasu) #9

Plot

After a magical disaster threw his family across the world, Rudeus is determined to reunite them all. The next step could involve storming a castle, and Rudeus is unwilling to back down from the challenge. But how will her half sister Aisha feel about reuniting with a brother who never came for her, a brother he never knew?