It was just another ordinary day at U.A. High School, and Class 1-A was engaged in their usual activities. Deku was scribbling notes, Bakugo was grumbling in a corner, and Todoroki was simply observing.

Suddenly, Uraraka gasped pointing towards Denki, who was casually sipping on something alarming. "Isn't that...bleach?" she whispered. Iida and Todoroki moved closer for a better look.

"Oh, it is!" blurted Iida, panic rising in his voice. "Kaminari! What on earth are you doing?" yelled Todoroki, as the rest of the class crowded around him instantly.

Denki looked at the bottle, and then at the bewildered faces of his classmates. "What? Is this not water?" He inquired, completely clueless about the danger he was in.

"No, it's bleach!" Momo cried, taking the bottle from him. She inspected it closely, her eyes widened in disbelief. Bakugo rolled his eyes, muttering something about 'idiots'.

Denki's face turned pale, realizing his mistake. "Bleach?" he mumbled. "But it looked like water. And had a cool name too." He looked genuinely confused and a little scared.

Aizawa appeared at the commotion, taking in the sight of his panicked students and the bottle of bleach. Sighing, he asked, "What's all the ruckus about?" His gaze landed on Denki.

Midoriya quickly explained the situation, while Denki stared blankly at his shoes, looking sheepish. Aizawa shook his head in disbelief and ran a hand through his hair.

"Kaminari, you can't just drink anything you see," Aizawa said wearily. "Especially not in a school full of people who can manipulate things." He looked pointedly at the bleach bottle.

Denki nodded, mumbling an apology. The students of Class 1-A watched as Aizawa walked away, with the bottle of bleach in his hands. Their hearts still pounded with worry.

Later, each of them took turns to talk to Denki about basic safety measures. Denki sat and listened, nodding occasionally. He was visibly shaken by his near-death experience.

"You need to be more careful, Kaminari," Iida chided, fixing his glasses. "What if something serious had happened?" Denki winced, fully understanding the gravity of the situation.

That day, Class 1-A learned an important lesson –- always double-check what you're about to consume. As for Denki, he'd never forget his brush with danger.

The incident with the bleach became a legendary tale in Class 1-A. Every time someone saw a bleach bottle, they would laugh and remember their scatterbrained classmate's mistake.

Denki, for his part, took the incident in his stride. He learned to laugh at himself, even when the others pulled his leg. After all, it was all in good humor.

He also became the poster boy for safety awareness. Although he hadn't intended it, his mistake had led to an increased emphasis on safe behaviors around the campus.

Moreover, Denki became a lot more cautious, examining every drink before consuming it. He even started carrying a water bottle everywhere, just to be safe.

The students of Class 1-A came to appreciate their classmate's newfound sense of responsibility. They admired his ability to learn from his mistakes and adapt.

Despite everything, life at U.A. High continued as usual. The students went back to their daily routine, but Denki's bleach incident remained a memorable chapter of their lives.

It served as a reminder that even heroes could make silly mistakes. It reminded them to always stay on their toes and make safety their top priority – be it in or out of the battlefield.

As for Denki, he learned his lesson the hard way. He now knew that bleach wasn't a fancy word for water. And he would definitely think twice before drinking anything without verifying it first.

The sunset painted the sky in hues of orange and pink as another day at U.A. High wrapped up. Class 1-A's dorm was filled with the usual chatter and laughter, the echoes of another unforgettable day.

Amidst all the fun and camaraderie, the bottle of bleach sat silently in a corner. It was a stark reminder of the day's incident, but also a uniting factor for the young heroes of Class 1-A.

They had faced many challenges together, but this incident had brought them closer in a way they hadn't anticipated. It was a testament to their bond and a symbol of their resilience.

Life at U.A. High School was always full of surprises, and this day was no different. The bleach incident may have been a scary situation, but it turned out to be a valuable learning experience for everyone involved.