Crossover Anime: Starting by defeating the Dragon King, then unexpectedly meeting a child.

"It's a pleasure to meet you too, Dongfang."

"I'll head back now if there's nothing else. It's been cold lately, so remember to keep warm! Goodbye, working soldier Aoyama."

"Yes, thank you for reminding me."

Aoyama Nanami thanked him, but then realized something was amiss and turned to look at the receding figure through the transparent glass.

He muttered somewhat disgruntledly, "Seriously, who's the laborer here?!"

However, these few simple exchanges added a touch of life to Aoyama Nanami's otherwise dull and monotonous workday.

……

Back at Aoki Apartment, he glanced at his neighbor's door next door, but there was no sound.

After taking out his keys and opening the door, he raised an eyebrow upon seeing the situation inside. There was someone in his house!

Of course, it was someone he knew, his upstairs neighbor.

She sat by the kotatsu, her head resting on the table, seemingly asleep.

She wore a brown coat and had short, light purple hair tied back with a yellow ribbon. She also wore a white eye patch; her eyes weren't damaged, it was just a personal preference.

I changed into slippers, tiptoed behind her, looked at my hands which were white from the cold, and then put them on her neck...

"ah!"

A scream came from inside the house.

Rikka Takanashi jumped up suddenly, and her head bumped into Dongfang Chen's chin with a "thud".

"Ouch, it hurts so much~"

She squatted on the ground, holding her head in her hands.

Dongfang Chen was fine after just rubbing his chin a little; his physical condition was much stronger than that of ordinary people.

He looked at the girl curled up on the ground, still groaning, and reached out to grab the tuft of hair on her head: "So, why are you in my house, you little brat?"

"Stop, stop! Let go of it, that's my favorite thing!"

Takanashi Rikka quickly grabbed Touhou Chen's hand and shouted.

After the farce, Dongfang Chen made himself a cup of hot tea, heated up the milk he had just bought for Takanashi Rikka, and sat down by the kotatsu.

"So, you came in from the balcony again?" Dongfang Chen stared at her.

"That is the descent of the Evil King's True Eye!"

She instantly became alert, covering her right eye (which was covered by a white eye patch) with one hand and making strange movements.

"I don't care what your descent into the world is all about, just stick to the front door! If you accidentally fall, you might die."

Dongfang Chen raised his hand and tapped her on the head, saying in an annoyed tone.

She clutched her head, feeling wronged, and said, "I can't break through the barrier set up by the Thunder Controller head-on. The only way to enter the barrier is to use the Evil King's True Eye..."

Dongfang Chen stared at her expressionlessly: "Speak like a human being."

"I don't have a key to your house..."

"This is my house. You'd be a fool to think you have a key to my house!"

Dongfang Chen looked helpless. This girl lived right above him, and the two of them didn't usually have any interaction. But one time, when he was researching superpowers on his balcony, she happened to see him from there...

Then, he became entangled with this girl and was even given the nickname "Thunder Controller" by her.

She would often run to his house to drag him to find some invisible boundary, or after making her sister angry, she would often hide at his house.

Over time, the two became familiar with each other.

"Have the Thunder Controller been searching for allies of justice these past few days?" Rikka Takanashi asked, looking at him expectantly.

"I just went back to Osaka for the New Year."

"I see. Now that the Thunder Controller has returned, let's go find the Invisible Boundary together. I can feel it calling me!"

"No, it's so cold outside. You better stay home! If you catch a cold, I won't take care of you."

"You are the Thunder Controller, how can you be scared off by a mere Ice Demon? In that case, I will lead the charge for you. Before the Evil King's True Eye, the Ice Demon is utterly useless!"

"Come forth, Dark Zex Prototype 2! It's time to fight side by side again."

As she spoke, she pulled out an automatic umbrella with a dark black and purple main color from somewhere, opened it directly, and waved it a few times.

Dongfang Chen's lips twitched, he sighed, and slowly stood up...

Chapter 16 No one is home, please leave!

"Go back to your own home."

Dongfang Chen grabbed Takanashi Rikka by the collar and threw her out like he was leading a chick.

Rikka Takanashi, holding her umbrella and standing outside the door, blinked, looking completely bewildered.

She watched the scattered snowflakes drifting in the air. A cold breeze swept by, making her shiver. She sniffled and decisively turned around to knock on the door.

"Dong dong dong."

"I was wrong to control the thunder! I can't fight the ice demon alone! Help!"

"Heh, isn't the Evil King's True Eye supposed to be omnipotent? This mere Ice Demon is yours to deal with."

Dongfang Chen's cold voice came from inside the room.

Rikka Takanashi tightened her clothes, her eyes flashing coldly: "Since that's the case, then I have no choice but to fight the Ice Demon to the death."

Dongfang Chen sat inside and looked towards the front door. There was no more noise outside; it was finally quiet.

He picked up his phone and sent a message to Sora Ginko and Kiyotaki Keika, letting them know that he had arrived home...

"Dong dong dong."

However, a short while later, there was another knock on his door.

He called out towards the door, "No one's home, please go back!"

"Thunder Controller, save me! The Ice Demon is too strong, I can't withstand its attacks any longer..."

The sound of birdsong drifting by can be heard outside.

He sighed helplessly, then got up to open the door, looking at the pitiful Rikka Takanashi: "So, what's wrong now?"

She said dejectedly, "The Evil King's True Eye's castle has been sealed by the Ice Demon, and I can't break through the defenses..."

"Forgot your keys?"

"Um……"

"Are you an idiot? Hey, what did I do to deserve this? Come on in."

In the end, they decided to let her stay at her own home for the time being.

"Here's a comic to read, just don't bother me."

Dongfang Chen casually tossed her a comic book, then retreated into the kotatsu (heated floor mat).

Having just been thrown out by Dongfang Chen, Takanashi Rikka calmed down and started reading a manga.

In the afternoon, I had another meal at his house.

"Rikka, when is your sister coming back?"

Around 8 p.m., he asked.

Rikka Takanashi shook her head: "I don't know, the Saint Soothsayers have been coming home very late lately."

"Alright, we'll just have to wait for now."

……

Around 10 p.m., there was a knock on his door.

Huddled inside the kotatsu, Dongfang Chen was too lazy to move: "Go open the door, it should be your sister coming back."

She nodded and ran to open the door; sure enough, it was her sister outside.

Rikka Takanashi immediately assumed a battle stance: "Saint, Saint Healer!"

Takanashi Touka stared at her expressionlessly, her hands clenching into fists. Before Takanashi Rikka could react, she had already been grabbed.

Two fists were placed on either side of Takanashi Rikka's head: "How many times have I told you? You're not allowed to run into other people's houses from the balcony again."

As for why Takanashi Touka knew she ran to the Higashikata's house from the balcony, it's because the rope on the balcony was still hanging there.

"Ahhh, I'm so stunned..."

Rikka, the little bird, screamed in agony.

A few minutes later, Rikka Takanashi was dragged into the house.

Takanashi Touka bowed slightly to Dongfang Chen: "I'm sorry, Dongfang-kun, Rikka has caused you trouble again."

Dongfang Chen also sat up and looked at the older sister who looked remarkably similar to Takanashi Rikka.

Unlike Rikka's short hair, Toka, as the older sister, has long hair, dark red eyes, a small nose, and a slightly full oval face, but she doesn't have any obvious expressions.

She was also about ten centimeters taller than Rikka, and even wearing a down jacket couldn't hide her graceful figure and two long, shapely legs.