Thunderclap and Flash (a kimetsu no yaiba x Boboiboy crossover)

Prologue

In a small Japanese village, close by the sea, everyone knew everyone. However, there was a family that stood out. A family of a mother and septuplets weren't native yet descendants of famous fishermen. They looked different with their faired skin, big eyes and pointed nose, spoke a foreign language and used crooked knives yet wore kimonos and yukata.

The eldest child was named Halintar, followed by Taufan, Earthquake, Blaze, Ice, Thorn and Solar, all 13 of age. Their mother, Aliya, was a fishing net weaver. Together, they lived peaceful and happy.

But, all peace perished that one day.

Early one morning, The oldest, Halintar was checking his wicker basket for Broken ropes. Then, layering himself in his thick kimono, his mother called him.
"Hali, where are you going?" She asked. The red eyed boy turned briefly to his mother.
"I'm going to visit Grandpa Shizuo. I want to make sure he's okay."

"Hmm," Aliya looked out the open door, frowning at the deep snow. "The snow's pretty heavy this year, so be careful okay?"
Hali smiled at his mother before being attacked.

"Hali, look! We got dried fish! And veggies!" Taufan waved the bag, excitedly.
"Dried fish!" Blaze repeated loudly, standing on Hali as if he had conquered a wild boar.

"Where's Hali going?" a voice called from behind.
Thorn and Solar walked in, smiling at the scene.
"I'm going to Grandpa Shizuo's house," Halilintar grunted, pushing Blaze off his back.
"I want to go!" Thorn whined, puffing his cheeks.

" Thorn, weren't we going to get sweets?," piped Solar, reminding Thorn.
"Oh, I'll go!" Blaze volunteered. "I want sweets, too!"
Thorn panicked, choosing between sweets or Grandpa.
"Noo!" Thorn ran back to Solar, hugging his arm.
Jealous, Blaze attacked Thorn, determined to get sweets.

"Oh yeah, where's Gempa and Ice?" asked Halilintar as he put the food into his basket, ignoring the sweet fight behind him.
" They're cutting firewood," Solar said. "Why?"
"He said he would pack tea leaves for Atok" Halilintar said.

"I'm here! "Quake shouted, giving Hali the tea leaves wrapped in cloth.
"Say hello to Atok for me," Ice said, sleepy.
Hali was ready to leave, before turning around to see his mother's soft sweet smile and this brothers waved excitedly at him as Thorn and Blaze fought over lollies.

"Don't forget to Grandfather Shizuo's candied fruit!" Blaze yelled, avoiding Thorn's slaps.
"Ask for lots!" Solar added, trying to seperate the fight.
"Yeah!" Thorn cheered, struggling as Blaze sat on him.
"Ish, you guys ..." Gempa rebuked. Aliya just smiled while Halintar held back laughter.
"All right, I'm leaving," said Halilintar.

He didn't know that was the last time he looked at their faces.