Thankfully, due to the dense fog obscuring the view, there were only a few places where the monster could be seen. The panic among the inhabitants was also confined to a specific area. Despite this, the tacit principle that the Holy Grail War must be fought in secrecy was completely undermined.
"I underestimated this guy... I didn't expect him to summon so many monsters."
As Saber spoke, another voice came from behind. It was a slightly childish voice, but the words spoken were extremely convincing.
"No, no matter how powerful the Servant is, there is a limit to the 'capacity' of the demons it can summon and drive—but if you don't consider the 'drive', there is no such limit."
"What...?"
Irisviel turned her head in surprise when she heard these words, and her eyes widened.
"Ah... It's that kid!"
"Don't keep calling me 'that kid'. I also have a name; my name is Fujimaru Shirou. You can call me Shirou."
Although Japan has a distinction between a first name and a last name, Irisviel and Saber are not Japanese and don't know much about this culture, so it could be completely ignored. What's more, for Shirou, he still preferred the more direct way of being addressed from his hometown.
Hearing Shirou announce his name, Irisviel also stated her name out of courtesy.
"Irisviel von Einzbern."
After they nodded to each other, Irisviel looked at the sea devils dancing their tentacles.
"That monster... isn't it under Caster's control?"
"I guess that's right," Shirou replied.
Irisviel was surprised because she was a magus, so she could clearly understand how terrifying this was. However, it was not difficult for Saber to understand the seriousness of the matter either.
"The so-called magecraft refers to the 'art of mastery', but that kind of creature is a real 'demon' that cannot be understood by such a small concept. Its whole body is full of gluttony, devouring desire to materialize. The act of summoning this kind of thing itself can no longer be called 'magecraft'."
Saber clenched her fists in anger as she thought of the Servant's madness.
"So, is this monster not going to challenge anyone?"
"Yes, it's just an invitation to eat. In a few hours, it's going to swallow up everything until nothing is left. Then, if left unchecked, it will gradually spread the damage to the entire city of Fuyuki."
"Damn!" Saber gritted her teeth.
It was clear that Caster had no intention of fighting anyone at all, but rather of destroying everything. At this moment, a voice suddenly came from the sky.
"Hey, King of Knights, it's a nice night... I want to say that, but it doesn't seem like the time to say hello."
Hearing a familiar voice, Saber turned her head. Holding the reins, the massive Servant, who was about to land the glittering Gordius Wheel in the park plaza where the two of them were, smiled disrespectfully at the people who arrived first.
"King of Conquest... You still don't know what to do; are you just here for fun?"
Seeing Saber not letting her guard down at all, Rider waved his hand.
"Don't do that; let's call a truce tonight. If you leave that big guy alone, I won't be able to fight you with peace of mind. I've sent out a call just now, and Lancer has responded. He should be here right away."
"... What about the other Servants?"
"I've killed Assassin; Berserker won't discuss it. Archer... It's useless to talk to that guy. With his character, he won't easily agree."
Saber nodded, placing her hand in front of her breastplate with a solemn expression.
"Understood, I have no objection to fighting alongside you. King of Conquest, although it is a temporary alliance, let's take an oath together."
"Huh... You were pretty sober when you were fighting... Well, what about it? Does the Master have any objections?"
"..."
Of course, it wasn't that he was dissatisfied, but seeing Rider and Saber happily put aside their past grievances, Irisviel was a little overwhelmed, while Waver showed obvious trepidation. Waver poked his head out of Rider's chariot console carefully, with no intention of getting off.
For those who are on the battlefield, whether it is to kill the enemy or form an alliance, it is a calm judgment without any personal feelings; this is consistent. This is the spiritual will shared by those who have lived through troubled times. That being said, Caster's madness must now be stopped anyway. If the oath can be kept, then joining forces is the right thing to do.
"I don't mind. I, Einzbern, promise a truce! Rider's Master, what do you think?"
Hearing Irisviel's call, Waver nodded reluctantly.
"So, what about the other one?"
Rider said this, turning his gaze to the other person, Shirou, who was watching with Lancer.
"I'm going to form an alliance too?" Shirou raised an eyebrow.
"Of course. What if you suddenly come out and backstab us while we're fighting that monster?" Rider's eyes were shrewd.
As the King of Conquest, he is experienced in both the battlefield and solitary combat, so he will naturally eliminate any factors that will be unfavorable to him before fighting.
"Well, I, Fujimaru Shirou, promise a truce."
Hearing Shirou's oath, the originally heavy atmosphere at the scene was suddenly relieved. Then, Rider spoke first.
"Either way, it's going to have to be done quickly. Even though that monster is still relying on Caster's mana to sustain itself in the present world, we won't be able to cope if it starts foraging for food on its own. Until then, Caster must be stopped."
Shirou followed suit.
"That guy's grimoire is the Autonomic Summoning Mana Furnace, an unconventional Noble Phantasm. It has now become the heart of the Sea Demon along with Caster, so he must be dealt with before it goes ashore to forage, or else it will—"
Needless to say, the rest could be understood.
"Caster is in the center of that pile of meat. What should we do?" Rider looked at the behemoth with a grim face.
"Get him out; that's the only way," Lancer spoke at this point.