Leveling up Kiryu's abilities is crucial for tackling tougher challenges. While fighting street thugs provides XP, there are more efficient ways to gain experience. Combining these methods will quickly boost Kiryu's stats and unlock powerful new moves.

- Eat at Restaurants: Eating a full meal at a restaurant provides bonus XP in all categories. Try to eat several dishes.
- Complete Substories: Many substories offer significant XP rewards upon completion.
- Clan Creator: Successfully completing Clan Creator missions can yield large amounts of XP, especially for Strength and Spirit.
- Battle Arena: The Battle Arena in Sotenbori offers repeatable fights with good XP rewards.
- Equip XP-Boosting Gear: Some accessories can increase your XP gain. Look for these early on.