Money (Yen) is essential for purchasing healing items, weapons, and enjoying Kamurocho's many activities. Here are the most efficient ways to earn cash:

- Tanimura's Arrests: Tanimura earns bonus money for arresting enemies with his 'Essence of Arrest' Heat Actions. This is a highly lucrative method during his chapters.
- Gambling: Mini-games like Mahjong, Shogi, and the Casino (Poker, Blackjack, Roulette) can yield massive payouts if you understand the rules and have a bit of luck. Save before playing!
- Sub-stories: Many sub-stories offer significant cash rewards upon completion.
- Street Fights: While not the most lucrative, regular street fights provide a steady income stream, especially if you have accessories that boost money drops.
- Hostess Clubs: Successfully managing a hostess club (Akiyama's side business) can generate substantial income.
- Selling Items: Sell any excess weapons, armor, or crafting materials you don't need at pawn shops (Ebisu Pawn).
Early in the game, focus on Tanimura's arrests and completing sub-stories. As you progress, mastering gambling mini-games can become your primary source of wealth.