Two-dimensional evil contract

Inadvertently sign a contract with the Dragon God Supreme, and get the Dragon God Mark! Since then, fate has changed! Learn what you want to learn? Want to learn knife skills? It's okay, summon Riven, Dance of Wings, and Front of Exile. Is magic amazing? Summon the dark head Syndra, the dark magic will kill you! The game characters are boring? Then let's have some second element. Want to learn ninjutsu? Summon Tsunade and Terumi Mei. Want time ability? Okay, summon the cute third sister. Want to learn space magic? It's even simpler, then Yuechan will call you.