In Chapter 12 you can to unlock the Coliseum. There are the rewards per level.
Guide To All Coliseum Rewards
Dice Cane- Win within 10 turns: Golden Moth.
- No allies knocked out: Golden Butterfly.
- No switching party members: Golden Rhinoceros Beetle.
- No using skills or calling for help: Golden Mantis.
- Win within 10 turns Viking Helmet.
- Do not use recovery skills: Golden Spider.
- No allies knocked down: Golden Scorpion.
- No switching party members: Golden Dragonfly.
- Win within 7 turns: Golden Stag Beetle.
- Win within 7 turns: Damascus Ladler.
- No allies knocked out: High Density Metal.
- Do not use recovery skills: Silver Ingot.
- Do not revive party members: Gold Ingot.
- No allies knocked out: Pearl.
- Win within 7 turns: Prestige.
- Win within 7 turns: Raw Platinum Ore.
- Do not use recovery skills: Raw Ruby Ore.
- Win within 7 turns: Raw Sapphire Ore.
- Do not revive party members: Raw Diamond Ore.
- Win within 5 turns: Violence Guitar.
- No allies knocked out: Empty Cough Drop Tin.
- Win within 5 turns: Beat Anklet.
- Win within 5 turns: Empty Cough Drop Tin.
- No switching party members: Revival Microphone.
- Win within 5 turns: Empty Cough Drop Tin.
- Do not revive party members: Electric Whip.
- Do not use recovery skills: Empty Cough Drop Tin.
- No allies knocked out: Dragon Boots.
- Win within 5 turns: Dragon Kinagashi.
- Win within 7 turns: Dragonhelm.
Source: https://gameplay.tips/guides/8947-yakuza-like-a-dragon.html
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