Kuri sat and worked on her Grimoire while Tanjiro got them some udon.

Tanjiro brought udon back with him.

Kuri stroked Nezuko's hair. "I'll help you…don't worry.

"Hey!" Tanjiro said to get her attention. "I'm back!"

Kuri blinked and quickly closed the book. "oh good I'm hung—" She stopped, staring, eyes silver.

"What is it?" Tanjiro asked, trying to follow her gaze. Then the scent hit him. "That's…" The smell of the one who killed his family.

Kuri said nothing, staring, as Tanjiro smelled it. "Him. He's here."

"I know. …." Tanjiro hissed.

Kuri gently kissed Nezuko on the forehead and then grabbed Tanjiro by the hand, leading him off into the crowd without a word.

Tanjiro stiffened slightly and gripped her hand.

They made it over, face to face with Muzan.

The Demon Lord turned to them passively, as if they were insects. "Oh hello. Can I help you with something?" His eyes raked over Tanjior, zeroing in on his earrings, then Kuri, with a sharp intake of breath.

Kuri blinked in fear as his eyes glared at her back and her hidden wings.

Tanjiro instantly got in front of Kuri. "I…"

Muzan balanced his child on his hip, flaunting the innocent. "Don't worry darling I think they mistook me for someone else? Right?" He flicked his hand out, striking someone, challenging the angel before him.

Kuri glared into his eyes, hearing his challenge and growling, lunging at him.

Tanjiro grabbed her and then held the victim down- "Kuri don't!"

Kuri stopped and turned to the victims, voice dropping to a soothing whisper. "It's alright Tanjiro. She touched the foreheads of the victims and they both fainted. "Everything will be fine."

"Kuri?" Tanjiro said, confused, looking at them. They looked better!

A woman appeared in a rush of smoke, beckoning them. Kuri lowered her head, working on the victims, whispering. "Come follow us when you can. Take…take care of Nezuko, ne?"

And then they were gone, with a small sniping boy leading Tanjiro on as he picked up Nezuko.

Tanjiro entered the small home, finding an exhausted Kuri sound asleep.

"She worked really hard. Tirelessly. She told me that she wants to make your sister human again?" Tamayo said softly.

Nezuko ran over and pulled Kuri's head into her lap. "Mmf!" She grunted protectively.

"I….she pushed herself again didn't she?" Tanjiro said worriedly. "

"It turns out she's been researching every night since she met you."

Tanjiro's look turned pained. "What? Is that why she's been…Kuri…"

Tamayo continued softly. "The injury to her leg there? She injected herself with demon blood. Your sisters I think…"

"mmf!" Nezuko growled.

"What?! Why would she…" Tanjiro said in shock, knowing now why she hadn't healed properly.

"To try and purify it." Tamayo smiled. "She really loves the two of you."

Tanjiro, awestruck, pet Kuri's head. "She…is truly amazing.."

"I've given her medication, but she might be a little bit loopy when she wakes so be careful." Tamayo smiled.

Kuri blinked. "Tama…ne?"

Tanjiro nodded at Tamayo. "Hey Kuri" He smiled at her.

"Tanchan! Hey!" Kuri slurred, trying to sit up, but Nezuko pushed her down firmly.

"No getting up right now!" Tanjiro scolded.

"But tanchan! Nezuchan!" Kuri slurred, then stopped, seeing the fire in Tanjiro's eyes.

"She's okay for now. You pushed yourself!" He accused.

Kuri wilted. "Your mad at me…"

"I'm not mad just worried." Tanjiro reassured.

Kuri, sobered, touched his hand, feeling him. "Frustrated, worried, scared…but surprisingly tender. Your…happy I want to help, happy I love Nezuko."

"…yes…" Tanjiro confirmed softly.

"Tanjiro…you don't need to worry. I'm gonna save Nezuko!" Kuri slurred, then winced. "when I get better, I'll work with Tamayo chan and…" She winced again.

"Hey. It's okay. What hurts? Why do you keep wincing?" Tanjiro asked, alert to her change in scent.

"My leg…the meds are kinda…" Kuri giggled. "hee hee!"

"You need to stop being so reckless! You keep running in and getting hurt. And I can't….I can't protect you all the time!" Tanjiro burst out passionately.

Kuri hugged him. "I'm sorry. I'm really sorry. I didn't know you would care this much." She squeezed him. "You really do consider me family if you care this much!"

"You're more than family…." Tanjiro said for the second time, hugging her tight.