Retry

Over the short time of 3 months, Izuku, Neri, Eri, and Stain had improved tremendously. Izuku had made a ton of new weapons keeping him on par with almost every quirk. Stain felt it was time to help Eri and Neri have more control over their power. He approached the two and brought them just outside Dagoba Beach with a chicken. "We are almost ready to reface the League of Villians, but what's stopping us is you two." Stain addressed sternly.

The two siblings face dropped with sadness. Stain laughed at the fact. "It seems you two are taking this the wrong way." Stain grinned. Eri and Neri looked confused. "I'm telling you that both of you can be potentially a game-changer in all the upcoming fights we are going to have." The two siblings looked shocked. "A move so powerful, even All Might won't stand a chance." Eri and Neri's faces suddenly changed from sad to overjoyed. They both looked eager to learn this new technique.

"What do we have to do?" Neri asked. Stain picked up the chicken. "Eri rewind this chicken one day." Stain demanded. She had trained her quirk enough to rewind the chicken roughly one day with ease. "Now, Neri fast forward the chicken one day." Neri could do approximately one day with ease too. "I don't understand, sir. What's the point of all this?" Eri asked. Stain grinned, "Now Neri, try to fast forward the chicken one day in time, and Eri try and rewind it at the count of three." They looked confused but went on with it. "three, two, one, NOW!" Stain said. Eri and Neri both used their powers on the chicken at the same time. For a second, the chicken stopped while everything else was in motion.

Before this, Eri and Neri were only able to freeze everything around them but now they could focus only on the enemy. They were amazed. "To use this in battle, freeze any formidable enemy that proves a threat to Izuku or us. I'm saying that if you learned this move, All Might wouldn't be able to pull what he did back at the League of Villians." Stain clarified. Eri was happy that she could help Izuku out. "I leave it up to both of you to learn this move. I give you three months to be able to hold it for at least 10 seconds." Stain said. The two were determined to conquer this move by the three months they had.

*Three months later*

Izuku or Stain had not seen Eri and Neri for the last three months. Stain intentionally locked them up in a room with just a bed, bucket, and a drain so they could work on their teamwork. Izuku delivered food through a small square at the bottom of the door for every three meals. Stain took the key and unlocked the door to let out Eri and Neri. Izuku missed them, so, as he ran inside to see how they were doing, he noticed the look on their face had changed from a child's expression to a more sophisticated appearance. They had excessive hair and look tired. The moment they saw Izuku, they smiled and lost consciousness. Izuku looked worried. "Relax, they've just been working hard." Stain assured Izuku. Three days later, they woke up at the same time. "Hmph. so they've been working on synchronization, I see." Stain thought to himself. Stain looked at them keenly, and they nodded confidently. "I know you guys just woke up, but we need to head to the League of Villians' new base now." The two siblings nodded as they headed out with Deku. Izuku was keen to know what kind of ultimate technique they've been working on for three months. They headed out.

As they entered the building with stealth, Izuku noticed Eri and Neri were way faster than before. It seemed they also worked on their physical strength. Momo stepped on a trap, and all the alarms began to sound. Izuku was ready. They all knew it wasn't going to go down the way it did last time. A barrage of villains attacked the group. Izuku, Stain, and Momo had no trouble fending them off. Izuku saw a group of them, and worriedly screamed, "Eri, Neri!" The duo smiled and charged at the mob. They were picking off enemies like flies. Izuku was shocked to see how much the two siblings had improved, not just at fighting but as a duo. It seemed he did not need to worry about them anymore. The team was fending off and making unbelievable progress when an unexpected turn of events occurred. "Boss, we can handle them. You don't need to get involved!" One of the thugs said. The thug was patted on the back and turned into ash. "Don't ever speak to me in that type of tone again!" The mysterious man said with an intense amount of malice. The moment Izuku caught a glimpse of him, he instantly knew who he was facing. It was the man that attacked Aizawa in the USJ.

Izuku had already researched about him and was aware his quirk was very dangerous. The power to turn everyone he touches to dust. Izuku approached him with caution. He started by using his electric kunai to keep a certain distance between him and the man. Stain began to charge at him recklessly with his sword. He knew if he were just able to scratch the man, they would win this fight. Stain suddenly saw someone behind him, and instinctively jumped up. The man jumped too to decay Stain. Stain was already in the air, so it was too late to dodge. "Eri NOW!" Neri commanded. Eri nodded, and they used their newly learned ability. They froze the man for three seconds, just enough time for Stain to drop. The other guy was shocked. Once they released their new technique, the man looked confused as to what just happened. "I don't understand. I was just about to decay Stain. Why am I here?" The man asked, confused. Stain smiled.

"So, you can only use three seconds?" Stain asked

"No, our max is twenty seconds at a time, but we refrained from using our max to reduce energy loss," Eri answered. Stain was surprised to find out how many seconds they could use. Izuku smiled, "So, this is the amazing technique they've been working on." He thought to himself, "I can't let them surpass me just yet." The other guy was still in awe. He felt his eyes were deceiving him. "Don't get careless around them." He advised, "You just might lose."