The restrictions began immediately.
Rin's new schedule arrived the next morning: individual training sessions at dawn, isolated from other students. All classes moved to private instruction. Even meals were to be taken separately to "minimize potential incidents."
He was being quarantined.
"This is ridiculous," Kira complained, having somehow talked her way into joining his breakfast in a cordoned-off section of the dining hall. "They approved you staying, then treat you like a plague carrier."
"They're afraid," Rin said, picking at his food. The restriction bracelet made even eating feel monitored. "Can't blame them."
"I can and will." She bit viciously into her toast. "Oh, I almost forgot. Your faculty mentor was assigned. You're supposed to meet them at Training Ground Seven in twenty minutes."
"Who is it?"
"They didn't say. Probably some ancient professor who'll bore you with theory while watching you like a specimen."
Training Ground Seven was the same place where Rin had first manifested Malachar in combat, where Adrian's Water Sentinel had attacked. The memory felt like it belonged to another lifetime.
A figure waited in the center of the arena, but it wasn't an elderly professor.
Elena Brightstar stood with arms crossed, her silver hair catching the morning light. Lumiel manifested beside her in a smaller, more casual form.
"You're my mentor?" Rin asked, shocked.
"Surprised? So was I when Headmaster Silvanus asked." Elena's expression was unreadable. "Apparently, I'm one of the few students qualified to supervise a Platinum rank summoner. Also, I requested it."
"Why?"
"Because everyone else sees you as a problem to manage. I see you as a rival to understand." She gestured for him to approach. "Besides, the board's restrictions are idiotic. Thirty minutes of manifestation per day? That's barely enough for proper training. Someone needs to teach you to maximize that time."
Lumiel's voice chimed like bells. "The demon boy intrigues us. We wish to see how far he can progress."
"Diplomatic as always," Elena said dryly to her summon. She turned back to Rin. "Here's how this works. Every morning, we train together. I'll teach you advanced techniques, combat theory, and how to function at Platinum rank. In exchange, you let me study your bond. I want to understand how a Nexus entity differs from traditional summons."
"The board wants me studied like a lab rat. Now you want the same thing?"
"No. The board wants data to justify their fears. I want knowledge to expand possibilities." Elena's eyes were intense. "There's a difference between being examined and being understood. I'm offering the latter."
Rin considered this. "What's the catch?"
"The catch is I won't go easy on you. Platinum rank means excellence, not excuses. Corruption or not, restrictions or not, I expect you to meet the same standards I hold myself to." She summoned her spear. "Now, manifest your demon. Let's see what thirty minutes gets us."
Rin activated his mark. The restriction bracelet flared with heat, measuring the energy flow as Malachar emerged. The demon lord looked around, then spotted Lumiel and grinned.
"The angel again. This is becoming a habit."
"A pleasant one," Lumiel replied, surprisingly cordial. "Your combat during the finals was impressive."
"You weren't bad yourself. That Divine Retribution nearly finished me."
Elena raised an eyebrow at the mutual respect. "Fascinating. They're not immediately antagonistic. Rin, can you feel Malachar's emotions through the bond?"
"Yes. Right now he's curious and slightly amused."
"And you, demon? Can you feel the boy's emotions?"
"Unfortunately," Malachar said. "He's nervous about disappointing you. Also hungry. He barely touched his breakfast."
"I wasn't that hungry," Rin protested.
"Your stomach disagrees."
Elena made notes in a small journal. "The merger allows bilateral emotional sensing. That's significant." She set the journal aside. "Now, combat assessment. Rin, I want you and Malachar to attack me. Full strength, no holding back."
"But you're supposed to be supervising, not fighting."
"I supervise best by participating. Now attack."
Rin and Malachar exchanged a mental glance, then charged. Their coordination had improved dramatically since the merger; Rin's tactical thinking combined with Malachar's combat experience created fluid, unpredictable movements.
Malachar's sword came down in an overhead strike. Elena blocked with her spear, then Lumiel appeared beside her, attacking from Rin's blind spot. Rin dodged, feeling the attack before seeing it through his enhanced perception.
"Good!" Elena called. "You're anticipating. But you're still reacting. Learn to dictate the pace."
They clashed again. Sword met spear, demon fought angel, but this time there was no hatred behind the strikes. This was practice, learning, growth.
After fifteen minutes, Elena called a halt. "Rin, dismiss Malachar but maintain a partial connection. I want to test something."
Rin dissolved the full manifestation but kept the bond active. Malachar's presence remained as a shadow, watching through Rin's eyes.
"Now try this." Elena moved through a complex combat form, her spear spinning in precise patterns. "Mirror my movements exactly."
Rin attempted to follow. His body moved clumsily at first, but then Malachar's experience began bleeding through. Muscle memory that wasn't his own guided his limbs. The movements became smoother, more natural.
"Excellent," Elena said. "You're accessing his combat knowledge without full manifestation. That's how you'll make thirty minutes enough. Use partial connection for technique, full manifestation only for actual combat."
They trained for another hour, Elena pushing Rin to his limits. By the end, he was exhausted but had learned more than in weeks of solo practice.
"Same time tomorrow," Elena said as they finished. "And Rin? Ignore the whispers. You earned Platinum rank. Don't let anyone make you forget that."
As Rin left, he nearly collided with someone in the corridor. A senior student he didn't recognize, with cold eyes and a sneer.
"The demon boy," the student said. "Platinum rank. What a joke."
"Excuse me," Rin said, trying to move past.
The student blocked his path. "You don't belong here. Everyone knows it. The board made a mistake letting you stay."
"Then take it up with them." Rin's patience was wearing thin.
"Maybe I will. Or maybe I'll just challenge you to a ranking battle. Prove that your demon is all you have." The student leaned closer. "Without that monster, you're nothing but a scholarship rat."
Malachar's presence surged within Rin, anger bleeding through their bond. Rin's right eye flared crimson.
"Walk away," Rin said quietly. "Now."
Something in his voice made the student hesitate. Maybe it was the merged tone, human and demonic overlapping. Maybe it was the corruption marks pulsing visibly on Rin's skin. Either way, the student backed off.
"This isn't over," he muttered, disappearing down the corridor.
"That was restrained of you," Malachar observed. "I expected you to threaten him more thoroughly."
"Not worth the trouble. The board's watching everything I do."
"True. But some people need to learn respect through fear."
"That's very demonic of you."
"I am a demon. Or have you forgotten?"
Rin smiled slightly. "Hard to forget when you're living in my head."
He returned to his dormitory to find a message slipped under his door. Expensive paper, sealed with wax bearing an unfamiliar crest.
"Rin Eldraven, you are cordially invited to a gathering of select students tomorrow evening. The Obsidian Society wishes to extend membership to those of exceptional ability and unique perspective. Your attendance would be valued. Location details will be provided to those who accept. Simply leave your response with the front desk.
Signed, The Founders"
"What's the Obsidian Society?" Rin asked aloud.
"No idea," Malachar replied. "But anything calling itself 'obsidian' is either very pretentious or very dangerous. Possibly both."
Rin tucked the invitation into his desk drawer. Another mystery, another complication.
His life had become a maze of politics, restrictions, and hidden agendas. The simple goal of surviving the academy had evolved into something far more complex.
A knock at his door. Kira entered without waiting, as usual.
"You look exhausted. How was training with Elena?"
"Brutal but productive. She's actually a good teacher." Rin showed her the invitation. "Any idea what this is about?"
Kira's eyes widened. "The Obsidian Society? That's huge! They're an exclusive club of the academy's most talented students. Getting invited means you're being recognized as elite."
"Or they want to keep an eye on me."
"Also possible. But Rin, this is good. If the Obsidian Society accepts you, it means other students are looking past the corruption." She grinned. "You should go."
"Maybe." Rin lay back on his bed. "I'm so tired, Kira. Not physically. Just... tired of being watched, judged, tested. I want one day where I'm just a normal student."
"You stopped being normal the moment you summoned a demon lord." She sat beside him. "But for what it's worth, I think you're handling it better than anyone could expect. You're still you, Rin. Corrupted or not, merged or not. You're still the awkward scholarship student who didn't know what a ranking board was."
"That was only a month ago."
"Feels like years, doesn't it?"
They sat in comfortable silence until Kira eventually left for her own classes.
Alone again, Rin stared at his corrupted hand and wondered what the next challenge would bring.
He didn't have to wait long to find out.