Chachamaru is a familiar from Tamayo used in transportation for her medical studies and research, Chachamaru wears talisman from Yushiro so it can grant invinsibility.

He is considered loyal helper and one of Yushiro's important companion.

Chachamaru will now aid Tanjiro and Saitama in collecting blood samples, and deliver it to Tamayo and Yushiro afterwards

...

After 3 hours from the battle, Susamaru who was freed from the curse has lost her prideful behavior, bloodlust and the use of her own blood demon art. She became a good demon that is not loyal to the demon king anymore. She is now an assistant and a maid of Tamayo and Yushiro.

Meanwhile..

The tired and injured Tanjiro was treated by Tamayo. Tanjiro groans while saying "ouch ouch"

Tamayo sighed as she says "don't wiggle, your body will recover for a few days"

Yushiro was muttering like "this baldy is really ignorant I'm gonna chop him for making my Chachamaru angry..!"

Nezuko was laying and rolling in the floor.

While Saitama is bored and recovering his mind. Although bored, he asked some interesting book from Tamayo.

Saitama looks at the fuming Yushiro and asked,

"Oh do you know some of the arrow demon's abilities, I saw you throwing some talisman in the floor and then some in the ground before Tanjiro beheaded him"

Yushiro become calm as he looks back at Saitama

"Oh that? I used my blood demon art called Blindfold, it allows me and the allies to see invinsible abilities...well I'm not just a support combatant, I can also fight hand to hand..." he crosses arm and acts bold being proud of his abilities

"Oh I see...good for you I thought you are only good at barking" he grin and gives thumbs up

"B-barking!??" He fumes again and quivers in irritation

Tamayo sighed and says "Yushiro...it's just a joke, don't take that seriously.."

"Tch.." he looks back and crosses his arm, he then sighed and calms down.

...

After one hour, Tamayo walks over at Saitama and stares at him with calm and curiosity.

Susamaru was behind Tamayo getting shy and avoiding contact with Saitama.

While Yushiro is getting curious of what Tamayo might ask Saitama.

Yushiro in his mind: "n-no you aren't gonna ask him for a date right? Right?"

Saitama who was sitting and reading a book in the floor stares at the three of them, he closes the book and sit tight as he says

"Hm? Is there anything you need from me?" in curious tone.

Tamayo sit beside Saitama and says

"Mister Saitama, by any chance how did you become so strong?"

Saitama stares at her with surprised expression, he smiles and says

"You want to know my secret?" He smirks

Yushiro gets extremely curious and want to know Saitama's secret too. He quiver and is impatient to hear what's the secret of the hero's overwhelming power.

Saitama sigh in happiness, he put his hand around his waist as he speak in proud tone "I become so strong I can one punch my opponents just having a 100 sit ups, 100 push up, 10 km run--"

But Yushiro interrupted as he says "hey that is basic training and common exercise...are you sure that is where your power originated?"

Saitama sighed deeply and nodded "yes, I become bald after that..." He then whined.

Tamayo and Yushiro looks at each other and says "I see that explains why you don't grow hair..."

"Oi that's rude!" Saitama gets slightly mad and looks away getting embarrassed of their comment.

Saitama noticed the shy Susamaru behind Tamayo, he gestures her to come forward.

"H-huh?" She exclaimed and slowly walk over Saitama.

When she walk towards Saitama with a shy behavior, she suddenly remember yesterday about what Saitama did to her.

"Oi are you listening?" Says the blank Saitama.

She suddenly get flustered seeing him very close and tries to maintain her composure in approaching the hero.

She was spaced out for a bit until she shake her head and breath for a moment.

"Relax...." In her thoughts as her heart pounds fast.

She then becomes calm and acts like she is okay, but she is shivering when she is near Saitama

"S-so what do you want from me?" Says the shy Susamaru.

Saitama smiles at her change of behavior as he pat her head and says

"Wow I don't know you just changed completely just for one night? How about we talk about your problems with me?" He grin being reassuring friend to her.

Her eyes and lips jerk in embarrassment as her head produce a steam, she run away and says

"I..I'm gonna buy something from the store! Right! lady Tamayo asked me to buy some pot and medical equipments! So bye bye!" in loud shaky tone as she avoid Saitama.

"Huh? Why is her face flushing red? Did I do something to her?" He was clueless why Susamaru was acting like that, he just shrug and forget about it

While looking back, he saw Tamayo and Yushiro arguing something in their minds

"Lady Tamayo! You aren't gonna ask more about him right?" In serious tone.

"Huh? What do you mean Yushiro?" Tamayo was confused of Yushiro's puzzling expression.

Yushiro shakes his head as he grab her shoulder and says in strict tone "do you like that baldy right??" His eyes goes watery

Nezuko who was watching them walks over at the complaining Yushiro and suddenly pat his head.

"Oi...." He suddenly accept her pat and sighed before calming down.

Tamayo smiles at Nezuko as she says "Nezuko dear, thank you for understanding him"

Nezuko makes a "mhmhm" sounds before she went to Tamayo and gave her a tight hug.

Tamayo let out a gasped as she chuckles at Nezuko's loving behavior, she also hug Nezuko back.

Yushiro gets jelous and gets mad at Nezuko.

"Damn, it should be me not her!" In his thoughts.

Yushiro sighed as he leaves them alone and walks over to Tanjiro.

As Tanjiro who was sitting at the corner while busy cleaning his sword, he saw the whining Yushiro, he stands up and says

"Yushiro? Are you okay?" in concerned tone.

Yushiro sighed as he tap Tanjiro's shoulder and says

"Okay I must admit your sister is cute and I lied about saying she was an old hag, but don't get the wrong idea here! I like lady Tamayo the most, so I won't let any of you especially that baldy to give her over my dead body!" in brave and proud tone.

Tanjiro smiles while responding in friendly tone "I'm glad you see my younger sister that way, I am relieved that you admitted she is beautiful and gorgeous...don't worry about it, mister Saitama is sure to understand you and will never steal anything precious to you.."

Yushiro smirks as he crosses his arm "hmph, be sure to tell that baldy never to steal her away from me..."

He then sigh as he looks away embarrassed "by the way thank you for helping us.... I'll promise to also help you in your journey whenever you needed us...don't hesitate to come to us anytime.." in shy tone.

Tanjiro chuckled at him as he grins in cheerful manner, he then says "you're welcome! We are glad to help you and lady Tamayo, we also promise to bring some blood samples so we can create a cure against Muzan, and hoping we can defeat him in the future..."

Yushiro looks away as he stared at the window while smiling,

"You are right, this time I feel like you and that baldy are the only hope of this world...I believe that the two of you will achieve in annihilating the demon king..."

He then walks back to Tanjiro and put his hand around Tanjiro's shoulder

"Tanjiro, promise me, do not ever die young....please! If you die I'll hunt you from your afterlife" His eyes jerk as he is also worried of Tanjiro's next journey.

Tanjiro smiles at him as he says "I will do my best, I will not die as long mister Saitama is at my side...rest assured we will defeat the demon king!" in friendly tone as he grins.

Yushiro sighed, he smiles and becomes relieved. Right now he trust Tanjiro and Saitama in their journey to defeat the demon king.

However, that only depends what fate will wait for them.

And after their small talk, they rest at the basement until morning without disturbance.

....

After morning, before Saitama and Tanjiro's departure

Tamayo, Yushiro and Susamaru while inside the house and avoiding the daylight are waving their goodbyes at them.

"Chachamaru is ready to go now, but he will be waiting patiently and avoid during daylight" says Yushiro.

"Yeah I'll be relying to Chachamaru..." Tanjiro pet the cat's head while smiling

Saitama trembles again as he says "can I touch this cute little-"

"No!" Yushiro block his way so Saitama can't touch Chachamaru.

Saitama surrenders arguing with Yushiro and says "by the way, we will be leaving now, so I hope the three of you will be living well.."

"Thanks for the concern mister Saitama, I also hope that the three of you will be safe in your journey.." says the smiling Tamayo.

Saitama smiles back and waves his goodbye before going out with Tanjiro. Nezuko is already inside the box while getting carried by Tanjiro

"Bye lady Tamayo, Yushiro...!"

"Bye Tanjiro..." Yushiro answers back while smiling.

The duo leaves at daylight early in the morning.

Saitama and Tanjiro walks around the farmland near the village.

Tanjiro's Kasugai Crow flew above as it shouted

"South-southeast! That is your next destination!"

Tanjiro makes a tired look as he says "I heard you, can you just quiet down and let me relax for a bit...?"

Saitama sneaks behind the crow while trying to catch it

"Kaaaw!?" The crow manage to evade Saitama and laughs Saitama off

"Hahaha~ try harder human" says the Kasugai Crow.

"Darn it!!" Saitama gets annoyed and surrender catching the crow.

But the duo were startled when someone shouted.

"Please marry me!!" A noise infront of them.

The crow gets frightened as it rests around Tanjiro's shoulder.

A small brown bird called sparrow suddenly asked help from Tanjiro to break off the yellow slayer disturbing the village girl. Tanjiro let the sparrow rests around his palm as the sparrow produce a cute noise.

"Chuchuchu!" A noise from sparrow that even Tanjiro can understand what's the problem.

Tanjiro looks at Saitama as he says "mister Saitama, I think we need to help them"

Saitama was baffled when he saw a kid wearing a yellow tattered kimono who is clinging to a disgusted girl

"Accept my marriage! You are the only one who save my dying life huhuhu" from the