This is a story shortly before they were locked up.
They went into a storeroom on an adventure, and the three of them are exploring various things.
Mika tries to leave, but Kachusha finds something golden and decides to stay.

English:

This is a story shortly before they were locked up.
They went into a storeroom on an adventure, and the three of them are exploring various things.
Mika tries to leave, but Kachusha finds something golden and decides to stay.