Maho Gakkou No Ochikobore 4 [Light Novel]

[Machine Translation] Finn, a young boy, runs away from the poor countryside and enrolls in a magic school in order to gain tax-exempt privileges for his family. In his third year at school, Finn is taken by his teacher Rubens to the nomadic kingdom of Baltic to negotiate an alliance. However, on the way back home after the talks, Rubens suddenly bids Finn farewell and leaves him alone on a ship. At first, it seems to be just an ordinary whim, but no matter how long they wait, he does not come back, and the whole country is in an uproar. Finn receives a direct order from the king, and sets off in a navy ship to search for him...!

家族のために免税特権を得ようと、貧しい田舎を飛び出して魔法学校に入学した少年フィン。学校生活も三年目を迎えたフィンは師匠ルーベンスに連れられ、同盟締結の交渉をするために遊牧民の国・バルト王国を訪れる。しかし協議を終えた帰国の途中、ルーベンスが突如フィンに別れを告げ、一人船に乗って去ってしまった。当初はいつもの気紛れかと思われたがどれほど待っても戻ってこず、国中が大騒ぎする事態に発展していく。フィンは国王から直々に命を受け、海軍の船で捜索に出発するのだった―!