After talking with Xenovia, Rias and Sona's group also learned that the purpose of the two's trip was to collect the other fragments of the King's Sword.
Because this matter also involved the "Sacred Sword Plan," and Yuuto Kiba had once been a victim of that plan, Rias was just about to state her intention to intervene when she suddenly heard Sona cry out beside her.
"Big Sister, you want to fight Seiya? No matter how you look at it, this is far too reckless! Seiya is only a Low-Class Devil. Please know when to stop, and besides..."
"A challenge from a Demon King? That does sound interesting. I accept your invitation to battle."
Sona had originally intended to persuade her unreasonable sister, but she had not expected Seiya, one of her own servants, to be just as troublesome. He actually accepted his sister's invitation to battle without hesitation.
"Seiya, are you going to fool around with my sister too? I know you're strong, but my sister isn't Kokabiel. Don't let her childish appearance fool you. She's even stronger than the former Demon Kings. Fighting her could really put you in danger..."
Before Sona could finish, Seiya, whose face was filled with fighting spirit, interrupted her again. "Haven't you figured it out yet? This isn't a challenge your sister proposed on a whim. It's a test for me. When some unknown guy suddenly appears beside the little sister she dotes on, what siscon could possibly feel at ease? To probe my background and see whether I truly have the strength to protect you, she probably wanted to do this from the moment she heard about me in the Underworld."
Hearing Seiya's words, Serafall waved the Magic Wand in her hand like a magical girl and stuck out her tongue in