Season 12 - Episodes 316 to 353
| jap# | int# | title | released | wiki |
|---|---|---|---|---|
| 316 | 341 | The Sullied Masked Hero (Part 1) | 21/04/03 |  |
| 317 | 342 | The Sullied Masked Hero (Part 2) | 28/04/03 | |
| 318 | 343 | The Lucky Cigar Case (Part 1) | 05/05/03 | |
| 319 | 344 | The Lucky Cigar Case (Part 2) | 12/05/03 | |
| 320 | 345 | The Art of Ninja Alibi Craft | 19/05/03 | |
| 321 | 346 | The Kidnapper's Disappearing Getaway Car (Part 1) | 26/05/03 | |
| 322 | 347 | The Kidnapper's Disappearing Getaway Car (Part 2) | 02/06/03 | |
| 323 | 348 | Heiji Hattori's Desperate Situation! (Part 1) | 09/06/03 | |
| 324 | 349 | Heiji Hattori's Desperate Situation! (Part 2) | 16/06/03 | |
| 325 | 350 | The Red Horse within the Flames (The Case) | 23/06/03 | |
| 326 | 351 | The Red Horse within the Flames (The Investigation) | 30/06/03 | |
| 327 | 352 | The Red Horse within the Flames (The Resolution) | 07/07/03 | |
| 328 | 353 | The Birthday Wine Mystery | 14/07/03 | |
| 329 | 354 | A Friendship That Can't Be Bought (Part 1) | 28/07/03 | |
| 330 | 355 | A Friendship That Can't Be Bought (Part 2) | 04/08/03 | |
| 331 | 356 | The Suspicious Spicy Curry (Part 1) | 11/08/03 | |
| 332 | 357 | The Suspicious Spicy Curry (Part 2) | 18/08/03 | |
| 333 | 358 | The Similar Princesses (Part 1) | 25/08/03 | |
| 334 | 359 | The Similar Princesses (Part 2) | 01/09/03 | |
| 335 | 360 | Secret of the Tohto Film Development Studio (Part 1) | 08/09/03 | |
| 336 | 361 | Secret of the Tohto Film Development Studio (Part 2) | 15/09/03 | |
| 337 | 362 | Hidden Circumstances of the Falling Incident | 13/10/03 | |
| 338 | 363 | The Four Porsches (Part 1) | 20/10/03 | |
| 339 | 364 | The Four Porsches (Part 2) | 27/10/03 | |
| 340 | 365 | Hidden Bathroom Secret (Part 1) | 03/11/03 | |
| 341 | 366 | Hidden Bathroom Secret (Part 2) | 10/11/03 | |
| 342 | 367-368 | The Bride of Huis ten Bosch (1 Hour Special) | 17/11/03 | |
| 343 | 369 | The Convenience Store Trap (Part 1) | 01/12/03 | |
| 344 | 370 | The Convenience Store Trap (Part 2) | 08/12/03 | |
| 345 | 371-375 | Head-to-Head Match with the Black Organization: A Dual Mystery on a Full Moon Night (2.5 Hour Special) | 05/01/04 | |
| 346 | 376 | Find the Buttock's Mark (Part 1) | 12/01/04 | |
| 347 | 377 | Find the Buttock's Mark (Part 2) | 19/01/04 | |
| 348 | 378 | Love, Ghosts, and World Heritage (Part 1) | 26/01/04 | |
| 349 | 379 | Love, Ghosts, and World Heritage (Part 2) | 02/02/04 | |
| 350 | 380 | The Forgotten Cell Phone (Part 1) | 09/02/04 | |
| 351 | 381 | The Forgotten Cell Phone (Part 2) | 16/02/04 | |
| 352 | 382 | The Fishing Tournament Tragedy (Part 1) | 23/02/04 | |
| 353 | 383 | The Fishing Tournament Tragedy (Part 2) | 01/03/04 | |
