There are 5 quests in Kobe Diorama Adventure.
There are few quests when you start the game, but more quests will be added as you progress through the game.

SILVER CALLENGE

A quest to collect a total of 45 Silver Cups.
After completing the quest, you can get a Silver Sword at the Weapon Lab.

GOLD CALLENGE

A quest to collect a total of 5 Gold Cups.
After completing the quest, you can get a Gold Sword at the Weapon Lab.

DIAMOND CHALLENGE

A quest to collect a total of 15 Blue Diamonds.
After completing the quest, you can get a Gold Cup.

TREASURE CHALLENGE

A quest to collect a total of 15 Treasure Chests in the sea.
After completing the quest, you can get a Gold Cup.

BOSS CHALLENGE

A quest to defeat the boss.
After completing the quest, you will clear the game.