"Zenitsu, good morning! You look like you are in a good mood, did something happen?"

"I met an angel- No! I met a goddess!"

Tanjiro just stood there confused, Y/N then goes outside their room while rubbing her eyes drowsily.

"Ah! Y/N good-" He's cut off by Zenitsu.

"Angel-chan! Good morning!" He says while wrapping his arms around her neck and nuzzling against her cheek.

"Zen…good morning."

Then it clicked.

Zenitsu met an “angel”, Y/N wasn't mad at him anymore.

Tanjiro wasn't sure about how to feel with this irritation inside him, Zenitsu is his friend, so he should be happy that they made up, right?

"Don't get too close to him Y/N, he's a disease."

"…? Don't you meant he HAS a disease?"

"Oh yeah, that's what I meant."

"HE SAID IT ON PURPOSE! HE TOTALLY SAID IT ON PURPOSE!"

"See? He's still a bit delirious."

"I'M NOT DELIRIOUS!"

"Poor thing!" Y/N says with a pitying look.

"WHAT DO YOU MEAN “POOR THING”?! I ALREADY SAID I'M NOT DELIRIOUS!"

♡

"Sorry for arriving late! I was-"

"One hundred push-ups."

"NOOOOO!"

Sanemi really is a demon.

After I finally finished doing the 100 push-ups, and of course, feeling like my body was going to fall apart, Sanemi suddenly speaks up.

"Why did you go with Tanjiro?"

"Huh? What do you mean?"

"Master told us about how you started traveling with him. Why did you accept the help of a stranger who didn't even speak the same language as you?"

"…Oh, my! It can't be…are you interested in me?! I didn't expect my charm to be that-"

"Forget it, brat-"

"Pfft- just teasing. About your question… Well-"

Maybe, just maybe… I would've had accepted Tanjiro help even if I didn't have the manga knowledge.

"His eyes, I suppose. He has very gentle and free of bad intentions eyes. I just ended up trusting him."

"Even after you discovered that he was traveling with a demon?"

"Well…it was quite the surprise, but I already trusted him at that point."

"Trust, huh?" He responded, avoiding eye contact with a mocking smile.

"People refrain from trusting others because they want to avoid getting hurt. And there's nothing wrong with that, no ones like to feel pain. However, when there is no pain, there's also no growth."

"…"

"Is there a problem with my face?"

"Please don't ever talk in such a mature way ever again, it's giving me the creeps."

"Damn, you even said 'please.'"

He turned his back to leave, his ears red.

It seems like the training is over.

♡

After fifteen days of training, I was finally able to use total concentration breathing without passing out, my nose still bleeds a little when I use it too much, though.

"Naho, Kiyo, Sumi! I want you guys to help us train! When we sleep, if we stop doing total concentration breathing, hit our covers with these blanket beaters!"

"You got it! But what about Y/N? Your beds are quite far from each other, so it would be hard to keep an eye on you two at the same time."

"That's true…" Tanjiro responds with a pensive look.

"Let's sleep in the same bed then!"

"In the same bed?!"

"Oh well, it's fine if you don't want to, I just thought it would be more convenient."

"It's not that I don't want it, but- it's a bit-"

♡

In the end, he couldn't refuse her.

He had his mind set in not moving a single muscle the whole night, so he would not end up accidentally touching any part of her body.

But…

Y/N is currently using him as a body pillow.

She just can't help it, he's really warm and smells like sun.

While the girl slept very happy the whole time, Tanjiro could not get a single second of sleep.

Naho, Kiyo and Sumi were not sure if they should tell Aoi about them sleeping together like this, since she has already gone through all the trouble of putting their beds as separated as possible.

But since they both looked happy, the girls decided to keep quiet about it.

♡

Ten days later, we both were in front of the two massive gourds.

Okay, today is the day that I finally will be able to use total concentration breathing without immediately dying!

We then started to blow into the gourds, the girls screaming “You can do it” while we tried.

And then, Tanjiro gourds bursts, mine bursting some seconds after.

"We did it! We broke the gourds! We did it!"

Tanjiro exclaims while jumping together with the girls.

♡

Now we were playing tag, Tanjiro managed to win against Kanao, and now it was my turn.

Come on, this is nothing compared to all the training Sanemi made me go through!

I thought as I jump to caught Kanao, accidentally tackling her and making both of us fall to the floor.

"Phew…sorry for tackling you." I say while still in top of the girl.

☆

Y/N quickly gets up to commemorate her victory with the others, failing to see the completely red face of Kanao still there laying in the floor.

The results were similar with the cup game, both of them won, and now they officially mastered total concentration breathing constant!

Now, all that's left is for Inosuke and Zenitsu learn it, the thing is…

"And then you keep doing it until your lungs go BOOM BOOM! And then you stop it."

Tanjiro sucks as a teacher.

"The technique Tanjiro mastered is called Total concentration : Constant." Shinobu says, appearing from behind him while putting her hand on his shoulder.

"By doing total concentration breathing every second of the day, physical fitness drastically improves. It's a basic move…a beginner technique, so of course, he could do it! But mastering it requires incredible effort!" She says, approaching Inosuke and giving harsh pats to his shoulder.

"Anyway, of course you can do it! If you can't, then that's that. It would be a shame, though."

An irk mark appears on Inosuke

"HAAAH?! If it's possible, then of course I'll do it! Don't talk down to me! I will mess you up! Grah!"

Shinobu then turns to Zenitsu, taking his hand and flashing him a smile. "Good luck Zenitsu, I'm cheering for you most of all!"

"….nah, no thanks, it's too much work."

"eh?"

Everyone in the room looked at the thunder boy as if he had grown two heads.

'What's with this lack of reaction? Should I be worried?' Y/N thought.

'Oh my, seems like I will have to change strategies...' Shinobu thought.

'Oh no, he reached the stage where he lost interest in other girls, he's too dangerous to keep around Y/N now!' Tanjiro thought.

'I wonder what's for dinner...' Inosuke thought.

Shinobu then went behind Y/N, putting her hands in her shoulders."Y/N is also cheering for you, right?"

"Eh?! Uh- Of course! Actually, well, if you succeed in mastering it I will… I will…give you a kiss in the...forehead(?)" Y/N says, unsure of what exactly might encourage him.

"I'LL DO IT!"

"It actually worked…" Y/N mumbled.