Most of you know "CLOUDY" as it is my first story. It basically was a Koro-sensei gets reincarnated in the Katekyo Hitman world.

Anyway, the Epilog heavily hinted at Koro going to Kunugigaoka to teach 3-E and hunt the current Koro-sensei. Well, CLOUDLESS picks up a little bit before and delves into Koro/Yucca's life once he reunites with 3-E.

-Koro either takes a year leave or goes on a mission to teach in Kunugigaoka.

-Byakuran enrolls in Kunugigaoka and since the boy's a genius (past life experience duh) he gets into 3-A.

-I dunno what Koro would teach, but maybe some history or stealth class, something related to underworld hierarchy maybe?

-Koro would enter school either after the Ritsu case or after Karma's arrival.

-Since some characters already met Koro (in CLOUDY), he isn't a total stranger.

A man, with orangish-brown hair, calmly sat in his office. His brown eyes traveled over the file in his hand, an amused smirk on his lips as he lazily flipped the page to the next one.

The mafia, was it? He chuckled. He didn't think his school would one day welcome a monster from who knows where, whose goal was to destroy the Earth. Or governmental officials and hitmen for all it mattered. But, although he much less expected the mafia to reach out to him directly, he supposed the situation was to be expected.

After all, the mafia, especially the supposedly strongest Famiglia, was bound to find out about the yellow octopus that would teach his students. Though he couldn't help the frown from growing on his face.

If they knew of the yellow being and the threat it represented, why would they want to teach by its side?

The question made him hum in wonder before his lips curled into a mocking smirk. Right, they probably tried to get to the failed experiment before but failed. Why else would someone whose job was killing, come to teach at his faculty?

Skimming one last time through the file, he shut it before letting it fall on his wooden desk. A light thump echoed in the room, followed by an oddly synchronized knocking sound on his office's door.

"You called, father?"

The adult smiled, leaning his chin on his crossed hands as he stared into his son's defying brown eyes. He chuckled.