What if Tanjiro was a Pure Saiyan? (DB X KNY)

Takeshi

Shinobu slams him into the ceiling.

Notes:
•This chapter will act as a substitution for Akaza Vs Tanjiro and Giyu's fight. After this chapter is over, it will continue back to the normal Demon Slayer continuity.

•Takeshi can recall the memory of his demon mother's death. And only that, because that's the reason he turned into a demon in the first place.

•All grades mentioned below are all part of Super Saiyan One (SS Grade 1 & 4 are just regular Super Saiyan states, while Grade 2 & 3 are bulkier versions of these Super Saiyan state, with Grade 3 way bulkier than Grade 2):
SS Grade 1 = 5x base power boost with stamina usage
SS Grade 2 = 6.25x base power boost & base speed increase
SS Grade 3 = 7.5x base power boost & 25% base speed decrease
SS Grade 4 = 5x power boost with no stamina usage.

- With Tanjiro, Giyu and Kyojuro (Immediately after they killed the demons) -
The three ran toward the closest Demonic presence, according to Tanjiro. Tanjiro said, "Judging from the demon's strength, it may be either Upper One or Upper Two." Kyojuro says, "That's fine. Three of us together should be enough, besides, you are as strong as two or three Hashira combined with that yellow hair of yours." Giyu stayed quiet throughout the run. Kyojuro was about to ask Tanjiro a question but was interrupted by a body breaking through the ceiling. The three stopped and looked at the body, which was now mangled at that point. It was then destroyed by something dropping right on it. Dust, from the wood being destroyed, engulfed the area with Tanjiro now finally sensing that demon. The dust finally settled and revealed a bulky demon with reddish skin and three horns on its forehead. Kyojuro said, "Kamado-shonen, I thought you said that the closest Upper-Rank was far off!" Tanjiro said, "Yeah, I thought so too. This demon was able to somehow mask its presence so I won't be able to detect it." Giyu said, "Hmm? Look! It's doing something." The demon's back opened up and spat out bones. It then slowly opened its eyes and the kanji it had, read,

Upper Six.

It then focused on the three ahead of it. Tanjiro said, "It's not attacking, why?" Kyojuro replied, "Perhaps it's taking a closer look at us." Giyu said, "I can feel its gaze and it f-" Giyu then dropped to his knees while panting. Tanjiro and Kyojuro looked at him with Tanjiro asking, "Giyu-san, what's wrong?" Giyu said, "I-I don't know. But I suddenly feel weak." Kyojuro said, "It's best to take this demon down before we find out what it's doing." Tanjiro said, "Right." The two assumed stances with Tanjiro powering. The demon had trouble focusing but finally focused on Tanjiro. He noticed the same material and colour he hated so much. He then picked up the dead Slayer's katana and lunged at Tanjiro while growing a punch. Tanjiro blocked the attack and the two were sent into the next eight rooms over. Kyojuro yells, "Kamado!" Giyu finally stood up and said, "Weird. It feels like that demon was taking away my strength. I still feel weak but some of my strength is back. We better help Tanjiro now." They ran toward Tanjiro and the demon.

- With Tanjiro -
Tanjiro and the demon, Takeshi, were in a battle now. Takeshi kicked Tanjiro's blade and finally spoke, "It's you. You killed her, didn't you?" Tanjiro recovered and asked, "What are you talking about? I didn't kill anyone." Takeshi threw many punches at Tanjiro with him blocking and saying, "The only things I kill are demons." The two finally paused with Tanjiro trying to remember. But then he was caught off guard by Takeshi using,

"Demonized Water Breathing, First Form: Water Surface Slash!"

Tanjiro just barely dodged the attack and thought in surprise, "This demon can use Water Breathing? How? Was he a Water Breather before becoming a demon?" Tanjiro begins to breathe slowly with Takeshi asking, "What do you plan on doing now? I know all your Water Breathing forms so it's pointless if you try to use any of them." Tanjiro's yellow aura then disappeared which in turn confused the demon. Tanjiro let out a deep breath and looked at the demon. He said, "Let's do this." The demon smirks and the two lunge at each other. Kyojuro and Giyu finally show up with the two in awe at them. Tanjiro and Takeshi were throwing slashes, punches and kicks. Tanjiro jumped into the air and dropped down using his foot and smashed it into his face. Takeshi grunted while Tanjiro then used his other foot and kicked him back. Takeshi regained his footing and kicked himself forward at Tanjiro, who also did the same. Giyu was gonna jump in but was stopped by Kyojuro, who said, "Not yet Tomioka. There isn't an opening yet. Once that demon is at a standstill, that's when we'll jump in with Kamado-shonen." Giyu looked at the two and reluctantly agreed. With Tanjiro's ongoing battle, Giyu thought, "Tanjiro... That day you were on that mountain with your sister. When I saw you... You were weak enough to bow your head at me and begged me not to kill Nezuko. You went through so many tough and gruelling battles and emerged victorious while getting stronger with each battle. You even fought and won the battle against Upper-Rank Three that time who Rengoku couldn't even beat. You faced Upper-Rank Six and another Upper-Rank Three and brought them down with your own might. And now that promise you made to return Nezuko into a human... It may come true. You've come a long way, Tanjiro, and today all of us will fight these demons and bring down Muzan's reign of terror."
Takeshi jumped back to dodge a slash from Tanjiro and winds his fist back. Tanjiro jumps forward and also winds his fist back. The two then brought their fists together at a force so great, that it caused another bright light and destroyed some of their surroundings while both Kyojuro and Giyu almost lost their footing. The pair were yelling as they applied more force to their fists and arms. Takeshi yanked his arm out of the way and punched Tanjiro's gut. Giyu and Kyojuro both gasped and saw that Takeshi was about to stab him. The two then used,