Preparation

In the living room of the mansion, Yuki and Yui were having a conversation. The front was soon heard of opening revealing the man of the house. Kono just finished cooperating with the police today, and they didn't have a lead but they know that this is just the beginning. Kono decided to gesture the two of them to follow him. 

When they arrived at the training grounds, Kono turns around to face his daughter and says

"From now on, I'll personally train you today, I'll teach you on combat, strategizing, leadership and techniques to survive in this world" says Kono.

"While I'm gonna supervise your academy, you'll be homeschooled." adding Yuki.

"After your training I'll see if I can get the approval of the government for your 'working experience'. Do you think you can do this Yui?" asks Kono.

"Yes I'll do what I can to become strong!" answers Yui with conviction.

"Mmm Good!" Kono seeing this only nods, satisfied with her answer.

Yuki decides to leave the duo on their own, while she is planning her own. Kono moves to a training rack and grabs a wooden sword, then throws it in front of Yui.

"Tell me Yui, who dictates the rules?" Kono questions.

"The government?" answers Yui with a tilt on her head.

"Yes… what else?" Kono questions again.

"... The strong?" answers Yui with a bit of hesitation

"Correct! Now Yui let me ask this, are you weak?" Kono questions Yui while staring straight at her eyes

"No" answers Yui

"ARE YOU WEAK!?" Shouted Kono

 "NO!" Yui shouts at her father

"Then pick up the sword and show me, show me Yui that you are not weak" Kono gesturing at the wooden sword

"Yes father" answers Yui while showing a smile

Kono picks up another sword for him, then waits for Yui to initiate the attack. Seeing that she must start the spar, she snaps her fingers to summon icicles behind her back and shoots. Kono seeing her daughter attacking, he simply waves his sword and behind that wave of a sword is an ice slice, destroying everything in front of it.

Seeing her attack didn't work, she runs to it and slices it using her wooden sword only to be broken and the ice wave. She quickly summoned an ice rapier to replace her weapon. Seeing her daughter is running to her, he runs to her too, only leaving a cloud of dust. When Kono revealed his location only to be in back of her and swinging his weapon at her.

When the attack is connected, Kono is surprised to see his attack being blocked by another ice weapon behind her back. Yui managed to block it and tried to kick her father, only to be blocked by a sword.

"SLOW!" shouted Kono

Kono tried to move his feet only to see it frozen. Seeing this he smiles at it. When he looks up he sees Yui swinging his weapon at him. He created an ice sword to block the attack. Seeing her attack failed, she falls back to create some distance and creates a pillar of ice heading towards Kono. Kono only swings his two swords in a cross pattern. The cross pattern slice travels all the way to Yui. Yui tried to block it with her swords only to be pushed back to a wall.

"Stop!, that's enough for now" shouted Kono

"Fooo~" Yui breaths out

"Not bad, for a beginner" Kono praises Yui

"Thanks for the praise father" Yui smiled at the praise of her father

"Your movements are rough, we can change that later on. We also need to improve your physique" says Kono

"I'll do what I can to become stronger." Yui says while staring at her father's eyes.

"Mmm, we'll start tomorrow, I have to plan our training for the future." Says Kono while nodding at her daughter's conviction

 Yui only nods at this.

"If I think you are ready, your gonna see the world soon" adds Kono

"Yes I'll show them my power to them" Yui smiles while looking at her hands

"Let's continue our spar outside so that you're mother can see what you are capable of" suggests Kono 

"Mhm" Yui only nods.

After taking a rest, they decided to take the training outside the backyard to avoid destroying the equipments in the basement. When they are outside, they move 20 meters away from each other. While Yuki is overlooking it in the middle of the spar. When Yuki raises her hand then moves it downward. 

Yui breaths out cold air to make a mist. The mist spreads out to cover the whole area. Kono seeing this only closes his eyes. Feeling anything that might disturb the wind. When he feels something, he blocks it only to see his weapon is being frozen. He waves his weapon to dispel the frozen parts and clears the mist around him.

What he sees are icicles moving towards him. He snorts at it and deflects them all. He suddenly moves his right arm to protect his left side from a pillar of ice trying to impale him. Yui is at the top of the pillar trying to swing her weapon at him. Only to see him smirking at her. 

She tried to move back when her weapon was grabbed. She abandons her weapon and snaps her fingers to create a 5-meter diameter giant icicle at the pillar of ice.

"[Grauhorn]!" shouted Yui

The giant icicle fired at Kono. Kono seeing this, only slices his weapon upwards. The giant icicle is sliced into two, when the middle is exposed, Yui is charging at him. When Kono sees this turns a little serious to showcase his prowess. The temperature is lowering to a few degrees creating a mist around him. Then he speaks

"Slice" Kono whispers

Yui hearing this immediately moves to the side by creating a pillar of ice on her feet and jumping on it. Then she sees an ice moving in a straight line cutting everything, making dust everywhere it goes and blowing her to the side. Yuki seeing this immediately catches Yui to not be blown away from the wind. When everything is cleared.

It shows a 30-meter long and 5-meter deep crevice and broken trees in a straight line. When everything is calming down. Yuki immediately heads straight to his husband, and yelling

"ARE YOU CRAZY!?" Yuki shouting at her husband

"OH… woops" Kono says while scratching the back of his head

"What do you mean by woops!?. YOU almost killed Yui!" Yuki shouts again at his husband's careless move.

"Now now I was in the zone of it" Kono trying to appease her wife.

"YOU!... sighs" Yuki just sighs at her husband

"Don't worry it won't happen again" Kono swears at his hearts

"IF you guys are sparring i must be there or there will be no sparring" Yuki demands

"Yes… yes…" Kono just answers his wife's demand

"Good!" Yuki answered then turning towards Yui

"AND you young lady need to take a bath" Yuki says at her daughter's sweaty face.

"Yes Ma'am!" says Yui while saluting then runs to her room.

When Yui is gone. Kono and Yuki looked at each other and smiled

"She's a genius at fighting" commented Kono

"Yeah I can see that" Yuki smiles at her daughter's talents

"At Least we will not be worried about her future" adds Kono

"Yeah" Yuki answers while holding her hands in her chest

The parents are proud of having such a genius daughter and their worries will be gone. When Yui is in the bathtub, she's looking at the ceiling and thinking about her father's strength. She reaches her hand to the ceiling emitting a blue light. When the blue light spreads around, it shows the same except the bathroom is now blue. Everything was frozen then everything was back to normal, it all happened in a single second. Yui seeing this is smiling at her quirk and thanking her parents for providing the strength she needed.