It's a Tale of Princess Kaguya au with spiritshipping and puzzle/blindshipping
Judai smiled with a finger to his lips, signalling him to keep quiet. Then he heard the koto being played before a baritone started singing oftly.
"Maware maware maware yo," Judai opened the door slowly and they went in silently "Mizu kuruma maware," He saw a man of dark skin and red hair up in a bun, his outfit was quite simple and colored with purples and blues "Mawatte ohisan yonde koi, mawatte ohisan yonde koi," Judai took his hand "Tori mushi kemono, kusa ki hana," they stopped behind the man "Haru natsu aki fuyu tsurete koi, haru natsu aki fuyu tsurete koi," Johan would partially see the man's front from there, his front bangs were blonde and his features were sharp "Maware maware maware yo, mizu kuruma maware, mawate ohisan yonde koi, mawate ohisan yonde koi," there was something nostalgic and sad to the way he sang "Tori mushi kemono kusa ki hana, saite minotte chitta to te, saite minotte chitta to te," for Johan it was both strangely familiar and terribly heartbreaking "Umarete sodatta, mizu kuruma mawari," for a moment Johan thought he saw something, another man, crying as he sang the same song on the balcony, "Senguri inochi ga yomigaeru, senguri inochi ga yomigaeru." Johan blinked and the vision was gone. The man stopped singing, tears in his eyes.
"Uncle," greeted Judai.
The man turned, and when he saw them his expression changed, from sadness to a rather fearful surprise. Tears began rolling down his face like raindrops.
"Uncle?"
"You're from the moon," he whispered.
"Sorry?" said Johan, just as confused as Judai.
"Your eyes, they're like gemstones, just like his."
Johan was a bit uncomfortable, that comment made him feel… Something, he wasn't sure what but he didn't like it much.
"I don't want to go back! Please!" Johan cried.
Yugi kneeled in front of him and hugged him gently.
"We have to go back Johan" he said softly.
"NO" screamed Judai, the moon guards keeping him still.
Yugi just petted Johan's back as someone brought an almost transparent pink feathered cloth and was about to put it on Johan.
" Wait " someone called.
Yugi looked up to the man and found himself breathless.
" You " he gasped "I-I know you… I think"
Atem was there.
He was on the brink of tears, and he sang "Maware maware -"
"Maware," continues Yugi almost as if he was in a trance "Mizu kuruma maware," he stood up, leaving Johan and the assistant frozen in place.
Atem smiled as Yugi walkes to him "Mawatte ohisan yonde koi,"
"Mawatte ohisan yonde koi," Yugi wide eyes filled with tears.
"Tori mushi kemono," Atem reached out to him with a hand.
"Kusa ki hana," Yugi's lips stretched out in a smile as he accepted the hand and jumped off of the cloud.
"Haru Natsu aki fuyu tsurete koi," both of them were crying.
"Haru natsu aki fuyu tsurete koi," they crushed each other in a hug. That was the most ungentle and unelegant Johan had seen Yugi do in his life.
"Atem!" Yugi cried.
"Yugi" he sobbed.
They fell on their knees, crying and repeating the other's name over and over.
Judai took the opportunity to free himself, running to Johan and dragging him off the cloud.
