My Favorite's Future Tenth Leader of the Vongola Was a Good-for-Nothing Ten Years Ago

[The title may change. I haven't decided exactly which series to cross over with, and the blurb may change, but the overall direction will stay the same.]

Kurosawa Akiya, head of his family, works diligently every day.

Then news spreads that the Tenth Vongola boss, his family's partner, has died, and the world falls into chaos.

As a Vongola partner, he adjusts the settings on a transfer bazooka, sending his memories to his past self ten years earlier so he can prevent this tragedy and save his family.

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Sixteen-year-old Kurosawa Akiya receives memories from ten years in the future and transfers to Namimori overnight, intending to meet the awe-inspiring future Tenth Vongola boss.

But when he sees the boy in front of him tripping over nothing as he walks, he falls into deep thought.

Kurosawa Akiya can't believe the person before him is the powerful boss from his memories.

He suspects his memories are wrong and decides to investigate carefully.

But...

Why does this useless boy seem cuter the more he looks at him?

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Eighteen-year-old Tsuna meets an underclassman, who is apparently a longtime business partner of his family.

Learning that the younger boy has a tragic background and that his family has fallen on hard times, Tsuna feels sympathy for him and takes extra care of his sickly underclassman.

Most importantly, the younger boy is an exceptionally rare normal person.

But later on...

Only when Tsuna sees Kurosawa Akiya pinning an enemy to the ground and crushing him, then turning to Tsuna with a beaming smile, does he realize something is off.

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*Kurosawa Akiya (top) x Tsuna (bottom)

*The top is younger than the bottom, and has a somewhat twisted, yandere side.

Theme: Every day we are alive is a miracle.