I, an OL died and reincarnated into the world similar to an otoge as the little sister of a super narcisstic prince. Sadly, he'll trigger death flags like a champ after his encounter with the allround-perfect heroine. How can I save my stupid Onii-chan?

The Final Class Till Graduation From The dragon tamer's School. Who will make it to the top? Who will fail ? Who can become a real dragon tamer?