11 Serafall Leviathan, Tanjiro's Determination.

In Kamado residence.

In the main hall, the girl who proclaimed herself to be a Maou(Satan), Serafall Leviathan was served tea by Tanjiro.

Sitting on the opposite side of Serafall, Tanjiro looked at her curiously and inquired, "So, Levia-san. Why did you come here looking for Juki-jiisan?"

"Hmmm…" Serafall stared at the young boy opposite to her, curiously. Something about him was vastly different from others his own age. Not to mention the amount of mana he possesses. She has never met anyone who could possess such abnormal amount of mana at such a young age. What was even more astonishing was the fact that the boy was only a human(?).

"So this is the boy, who is said to be the reincarnation of the legendary first Evil Slayer. He puts all the young devils in the same age category as him, including my So-tan, to shame with his abilities. His mana alone is on par with most high-class devils. I can't even imagine how powerful he will be when he is grown up. If he wasn't an Evil Slayer, I would definitely want him in my peerage." Serafall thought as she looked at Tanjiro. Seeing that Tanjiro was waiting for an answer, she…

"Before we talk, how about you introduce yourself to me☆. I already introduced myself☆. Also, call me Levia-tan☆." Serafall said with a cheerfully childish smile.

"…" Tanjiro speechlessly stared at her.

"Her way of talking is… quite unique.." Tanjiro thought.

"Cough.." Tanjiro coughed to clear his throat, and said, "My name is Kamado Tanjiro, the future head of Kamado clan. I am also an Evil Slayer in-training under Juki-jiisan. It's a pleasure to meet you, Levia-tan."

He said it seriously. But to Serafall, the young Tanjiro's serious expression was just so adorable. Added to that…

Hearing Tanjiro call her 'Levia-tan', Serafall was stunned for a moment. But soon after, her smile widened and her eyes shining with excitement and joy, which confused Tanjiro very much.

But what baffled him more was that…

Serafall suddenly jumped at Tanjiro and hugged him, burying his face into her rather large breasts.

"Ah!" Tanjiro, realising what just happened, blushed hard and panicked.

"Tanjiro-chan, you're such an adorable child☆."

Serafall had a expression of enlightenment on her face, as she thought, "Never have I desired to hear something so much and never knew until I heard it."

Till now, almost no one has called her the name she wanted to hear, mostly because of her status as a Satan. And the ones who called her that, couldn't be more obvious about being fake.

But now, Tanjiro, who knows of her identity, but still 'acknowledged' her 'true' name, made her so happy. Even her beloved little sister has never called her 'Levia-tan' with such sincerity. At this moment, she felt like she was floating in a cloud of happiness (Exaggerated).

While this is mostly because Tanjiro is still not aware of the weight behind her status as a Satan, Serafall didn't even think of such a possibility.

She looked at Tanjiro, whose face was as red as a tomato due to the situation.

"Tanjiro-chan☆. You're the second most cutest person I know now☆."

"…."

…..

After getting away from Serafall's embrace, Tanjiro controlled his breathing to calm his disturbed mind. Currently his mind was filled with the softness of Serafall's big breasts.

While he was doing that, Serafall was talking to him about how she considers him to be the second cutest person she knows, second only to 'So-tan'. As for who this 'So-tan' is, Tanjiro has no clue. In a sense, Tanjiro was also similar to Serafall in the past, since he considered his little sister the cutest.

Though, Tanjiro had no idea that the person he was sympathizing with, is on a whole different scale when it comes to adoring her sister.

Regardless, he just let Serafall carry on with her babbling, since she seemed to be quite happy while talking. He just patiently listened to her.

Serafall was feeling quite happy now. She never imagined that the person who would patiently listen to her 'passion' would be a seven year old boy. Even her beloved little sister refuses to listen to it, as she feels that the topics are embarassing. Her sister was too serious at such a young age. But Serafall felt that was also her little sister's irresistible charm.

After Serafall was done with her 'sister talk' and 'magical girl talk', Tanjiro asked..

"So, Levia-tan. For what purpose is a Maou like you here to meet Juki-jiisan?"

Serafall slightly trembled and looked visibly happy, when she heard Tanjiro call her by her desired name. But became silent as she noticed how serious the young boy was.

"So, Juki-chan never revealed his situation to Tanjiro-chan. I can't just tell it to him." Serafall thought, as she looked at the serious expression of Tanjiro.

"As the current representative of Evil Slayers, Juki-chan is required to attend a conference in the underworld☆. I just came here to inform him☆." Serafall said.

Only… after she spoke, she didn't get any reply. Curious, she looked at Tanjiro's face, only to be a bit shocked by what she saw.

Tanjiro was staring at her with emotionless eyes. There was no expression on his face, just a calm look. Serafall was shocked to see such a look on a seven year old child.

Serafall felt completely bare in front of Tanjiro's gaze. Even she, a self-proclaimed magical girl, felt a bit creeped out by his gaze.

Tanjiro, who was still using 'Transparent World' to observe her, calmly said, "Why do you lie, Levia-tan? Juki-jiisan is required to attend a conference in the underworld? And you, a Satan, is the messenger? At least make up a better lie. Evil Slayers are neutral to other factions, as such, no factions have the right to force Evil Slayers to act for their purposes. Even with my limited knowledge of the supernatural factions, I can tell that much."

"…" Serafall had a slight blush on her face, as she turned her face to the side to avoid looking at Tanjiro. Even she felt a bit embarrassed for her blunder. If she knew that Tanjiro was this perceptive, she would have made a better excuse instead of casually making one.

"Hm?" Before he could continue questioning Serafall, Tanjiro sensed Katakiri Juki's presence nearing the Kamado residence.

Tanjiro turned to look at a clock hanging on the wall. It showed that the time was 11 PM.

"Its already this late. I finished my training around 8 PM. Which means, I spent almost 3 hours with Levia-tan. Time went by pretty fast without me realizing it." Tanjiro thought, as he deactivated 'Transparent World'.

….

Soon, Katakiri Juki entered the residence. But when he saw Serafall along with Tanjiro, he tensed up a bit.

Seeing Tanjiro's serious expression, Katakiri Juki didn't know what to say.

"Leviathan-dono, what might you be doing at our residence this late?" Juki asked.

"Well…" Serafall was stumped, as she didn't know how to convey her message in Tanjiro's presence.

Noticing Serafall's silence, Juki said to her with a helpless smile, "It's fine. You can say it. I think it's about time young master got to know about my condition."

While saying it, Juki turned to look at Tanjiro with a look of guilt.

"Is this about that black spot on your upper body? Juki-jiisan." Tanjiro inquired quietly.

"Un. So you knew about it after all. Just like your grandfather suspected, you indeed possess the same ocular ability as the first Evil Slayer, Kamado Yosuke." Juki nodded and continued, "I have mentioned the incident that happened during your birth. I got this injury from that unknown monster. This wound just won't disappear. I had tried a lot of methods from numerous other factions. But all it did was extend my dying life a bit."

"…." (Tanjiro)

Serafall, who had been silent, said, "We have a medical research center under our Sitri family. We were also the ones who found out a way to extend his life by little bit. But because the energy of the unknown monster is in Juki-chan's body, it prevents him from being cured. Till now, no available magical elixir has been affective on him. I came here today to check up on him, since he pretty much ceased any contact with us from four years ago. Other than me, there aren't anyone capable enough to enter this place, in the Sitri family. So I had to personally come☆."

Hearing Juki and Serafall's words, some questions in Tanjiro's mind was answered.

"So that gloomy unpleasant scent on Juki-jiisan was the scent of death. Now that I think about it, there was never any intent on the scent. As if it was a natural occurrence. Even my sense of smell is on a supernatural level now. Now I can even pick on the scent of death. Something I wasn't capable of in the past." Tanjiro thought.

"…. How much time do you have left?" Tanjiro asked Juki.

"About two years. But, I don't need to extend my life any longer. You have grown stronger, and will get even stronger before I perish. You will have the power to protect yourself, young master. I have almost fulfilled my responsibility, the promise I made to your parents, grandfather and the clansmen who sacrificed for you." Juki had a weak smile on his face.

Tanjiro made a pained expression upon hearing Juki's words.

Even Serafall was quiet, with a frown on her beautiful face.

"Your responsibilities are not over, Juki-jiisan."

"…" Juki looked at Tanjiro, surprised.

Serafall looked at the young boy curiously.

As Tanjiro stared at Katakiri Juki, memories of the people he had known, dying, surface in his mind.

"In my past life, I kept on letting people I know die, without being able to do anything. My family, Rengoku-san, Oyakata-sama, Shinobu-san, and others. I was unable to do anything but watch them die. But… I won't repeat the same things again. I have a system that is literally spoon-feeding me with the ways to get stronger. I am capable of many things I couldn't do in the past. So this time…" Tanjiro thought, as his expression turned into that of determination.

Tanjiro looked at Katakiri Juki with a determined look and said, "I won't let you die, Juki-jiisan!"

"Young master…" Juki didn't know what to say after seeing Tanjiro's determination in his eyes. He felt very emotional right now. But Juki knew that, he didn't have much time anymore. Even the likes of Phenex's tears was useless on him. And now, even the method the Sitri family used to extend his life, has become ineffective.

Regardless of Katakiri Juki's negative thoughts, Tanjiro was determined.

"I will definitely find a way to save him! To me, Juki-jiisan is my only family in this world. No matter what I have to do, I'll find a way to save him."