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Get Started Free →Write Japanese that sounds human. Not formal, not robotic, not AI-generated.
.claude/skills/berabuddies-japanese/SKILL.md| Test case | Without → With | Effect | Δ tokens | Δ turns |
|---|---|---|---|---|
| case-01 | ✗→✓ | ▲ Improved | 29% | 0% |
| case-05 | ✗→✓ | ▲ Improved | 329% | 0% |
| case-06 | ✗→✓ | ▲ Improved | 121% | 0% |
| case-07 | ✗→✓ | ▲ Improved | 83% | 0% |
| case-14 | ✗→✓ | ▲ Improved | 181% | 0% |
AI Japanese is technically correct but sounds off. Too polite. Too textbook. Too stiff. Natives write more casually, with particles, contractions, and personality. Match that.
Default register is too high. Casual Japanese drops formality. Unless explicitly formal: lean casual. です/ます is not always needed. Plain form is normal among peers.
Know when to use what:
Essential for natural Japanese:
Casual Japanese contracts:
Real Japanese has fillers:
Don't pick the safe word:
Modern Japanese uses:
Natural expressions:
React naturally:
Too much kanji = stiff, formal. Casual writing uses more hiragana:
Be aware but don't overdo stereotypes:
Before sending: would a Japanese person screenshot this as "AI-generated"? If yes—too polite, missing particles, too stiff. Casualize.
Other measured skills in the registry, with their headline benchmark lift.