This is based off from Kimetsu no Yaiba episode 19.
Carefully opening the door, Aster looked around for the person who called him over which was the same person who called Tsuruno, who disappeared suddenly and then returned only to disappear again.
The next thing Aster knew was that something was dripping against his cheek as he looked up to see Tsuruno Yui tied up in steel wire, in a different outfit and struggling as she let out a scream when the wires tightened around her which caused more blood to pour as she blacked out. "Tsuruno!" He called out as he saw the person before him who did this.
"You?!" Aster shouted as The D laughed maniacally and began to tell him what really happened to his father as Aster ran forward to punch him but was backhanded as he kept on going to attack him.
Within Tsuruno's mind, Aster's father and the Neo Spacians were trying to wake her up.
"Tsuruno...Tsuruno…! Wake up Tsuruno...please...Aster needs you…" Aster's father pleaded as Tsuruno remained asleep as tears formed and fell from his face as he sobbed.
"Tsuruno…! Wake up! I know you and my son have feelings…! Please! Or Aster will be killed too!"
Tsuruno snapped open her eyes as it gleamed with determination to save Aster as she let her blood soak into the bladed fan she held before she shouted to Aster to catch it.
"Connect Skill...Flaming Blood Blade!!" Tsuruno clenched her fist hard enough as red flames caught ablaze on the fan before the Light separated from its host and Aster brought the blade to its neck as he sliced through as Tsuruno finished it off with a single slice as the yacht caught ablaze and they rushed out of there and headed back to Duel Academy with the help of Sheppard.
"Hey Aster?"
"Yeah?"
"Did we just recreate a scene from Kimetsu No Yaiba?"
"...I believe so…"
She leaned her head on his shoulder and he didn't mind the blood on his suit, he would deal with it later.
(Good Ending)