Hitori Heya no Kagi Azukemasu ~Sutekina Daiichihakkensha~

Single strangers exchanging spare keys just after meeting!? Where will this male-female friendship lead, when it started solely to avoid a "Lonely Death"!?

"If you die suddenly... I’m okay with being the one to find you."

Kii-chan is the manager of a thrift shop who is terrible at cleaning and organizing. Mr. Son is a freelance designer who is a total clean freak.

To ensure they don't die alone and go undiscovered, these two have entered into a unique arrangement: holding onto the spare keys to each other's apartments...!?