
“He checked under the bed. Something checked back.”
Every child knows the rule: don't look under the bed. Underneath is a dark cel-shaded horror anime short following Carter, a boy who breaks that rule and pays the price. Snatched from his bedroom by Grin Face — a silent smiling entity that lives in the dark gap beneath his mattress — Carter is dragged into The Tuck In, a lightless void filled with grinning creatures, reaching hands, and a relentless nightmare called Hudson Hippo that doesn't stop, doesn't slow down, and wears a smile it was born with.
His only hope is Luna Lu, a girl with pink spiral eyes who already knows this world. She's been here before. She gets Carter out. But the final shot tells you everything: Grin Face never left. It was never under the bed. It lives there. It will always live there.
“What's underneath is real.”

He broke the rule

She's been here before

It lives in the dark

It always wears a smile

The Bedroom
Where the rule gets broken

Leafless Ridge
The landscape beyond the gap

No Whereabouts
A void with no coordinates

The Tuck In
The lightless void beneath the mattress
Location
The Tuck In — a lightless void beneath the mattress
The Rule
Don't look under the bed
Format
Dark cel-shaded horror anime short
Tone
Childhood fear. Made real. It never left.