So a boy is dropped into the magical and dark side of the world due to some circumstances. To protect his family and friends, he has to get power.
He is then kidnapped by the villains of the story. They are the 2nd biggest organization right behind the good guys.
He is then recused by a teacher of the biggest organization. They train him and when he is ready, they send him on an adventure for him to get powers. On the adventure, he makes some friends and allies
As always, the MC wins and gets power.
When he goes to report to his teacher, but they are nowhere to be found. The only thing left is a note.
The 2nd book is about rescuing his teacher and defeating bad guys with his friends and allies.