Tenshi Muhai no Isekai Kenja: Game no Job de Tanoshii Second Life

Yuki was reincarnated and summoned to another world the moment he defeated the last boss of an online game he was addicted to. He becomes a "Sage," the most powerful job in the game, but he is thrown out of the castle by the king and the other heroes who were planning to summon the true "Hero." Yuki thought that unlike in the game, the "Sage" profession was weak...... but then he realized that he actually has enormous magical power and could acquire various abilities, just like in the game, and he decides to live an enjoyable second life as an adventurer. However, the king, realizing Yuki's strength, now considers him a threat and sends assassins after him. However, Yuki easily fights them off and rises through the adventurer ranks with Aleria, a princess from a neighboring kingdom, with whom he somehow ends up forming a party. The second life with the strongest job starts from here! (Source: MF Books, translated)