Try to use any item with a sign.

Take over the property of Mr. Jones.

Get the electricity back on.

Find water to make coffee.

You have cleared the most difficult level in the Secret Arena.

You have cleared the Maid Cup in the Arena.

You have cleared the Silver Cup in the Arena.

You have cleared all sub-quests.

Weapon max strengthening level changed to 100.

Weapon max strengthening level changed to 50.

You have inflicted 100,000 damage in one attack.

You have inflicted 7,000 damage in one attack.

You have reached 15 consecutive hits.