Izuku is Sumiko's twin, older by two minutes. Yet, that two minute difference has turned her into an absolute menace of a younger sister. Sumiko is the type to walk into a room full of toddlers and make all of them fall silent because of the menacing aura she gave off.

In reality, she wasn't even that scary. In fact, she was actually kind of shy around people she didn't know. With people she did know, it was a different story.

It was 10 AM and everyone had practically woke up. Everyone except Sumiko. Or, so they thought.

"ONII-CHAN!" a yell was heard from Sumiko's room. "WHAT IS THIS?!"

Izuku sighed, figuring it was just a bug and headed over to Sumiko's room. But he was so wrong.

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As soon as he walked in, a notebook slammed into his face, nearly breaking his nose. He rubbed his poor nose and picked up the notebook, saying, "You could've blinded me!" Then he looked down at the notebook and immediately wished she had actually blinded him.

That was... his diary?!

At that moment, pretty much all of Japan could hear his scream.

The other student immediately rushed over to check what was wrong and had their minds blown at the scene in front of them. Sumiko had a green notebook under her armpit and was making heart signs at Izuku while Izuku had gone on full beast mode and was chasing her like a madman, screaming, "NOBODY WILL FIND YOUR FUCKING BODY!"

Then Sumiko started yelling "DEKU WANTS TO KISS HIM! DEKU WANTS TO KISS HIM!" like it was a war chant and Izuku started throwing things at her. Momo Yaoyorozu, ever the party pooper, cleared her throat. The twins slowly turned towards the group watching them.

"... Let's burn the school," Izuku said, their embarrassment briefly uniting them.

"Seconded," Sumiko said. "Leave no witnesses."

Thankfully, both were subdued thanks to Shoto's ice powers. A true Elsa.