The Ultimate Covenant (Unabridged‪)‬

Sometimes your emotions have you making crazy decisions. Love, for instance: You can love someone or something so much you might be willing to take on the world. Even if that means putting yourself in danger, who knows why this is? Where does this sudden surge of energy or strength come from? 

Akio Ball is a young male who was so shy he depended on his best friend, Constant Saisei, for everything. She even fought battles for him, until one day, she fought his last battle, which turned out to be her final battle as his best friend! Left alone, Akio had no choice but to defend himself and break the shackles he placed on his feet. One day, while at school, heading to his desk, he receives a letter filled with emotions and an agreement from someone who claimed to be his best friend. Carrying the regret of never telling his best friend how he felt about her, he doesn't hesitate to fulfill the agreement and find out if it's truly the one he most loves.