Top casinos with bonuses on second deposit · Page 6 of 15
Terms & Conditions apply · Play responsibly
AllStarz Casino
Start Your Gaming Journey with a Stellar €1,200 Bonus + 300 Free Spins!
- ✓ Japanese players are accepted
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- ✓ Over $20.2 Million in Jackpots by Games Global
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- ✓ Rating: 3.9/5
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Terms & Conditions apply · Play responsibly
TombRiches Casino
Explore the splendors of the Ancient World with 200 free spins and up to $2,000 in bonuses!
- ✓ Japanese players are accepted
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- ✓ Tested and certified by Casino Bonus Center · Rating: 3.9/5
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Terms & Conditions apply · Play responsibly
Nomini
A Fresh Burst of Fun! Claim Up to $500 + 200 Free Spins
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- ✓ Tested and certified by Casino Bonus Center · Rating: 3.9/5
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Terms & Conditions apply · Play responsibly
Loki Casino
Up to $21,000 bonus & cashback in casino games!
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- ✓ Over $20.2 Million in Jackpots by Games Global
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- ✓ Tested and certified by Casino Bonus Center · Rating: 3.9/5
- ✓ 86 Game Providers: Play n GO, Amusnet, ELK Studios, Ortiz, G Games, Kiron Interactive, Booming Games, Nucleus Gaming, Wazdan, Revolver Gaming, Gaming Corps, BF Games, and others.
Terms & Conditions apply · Play responsibly
SpinStar
Race to Win a BMW and enjoy Huge Bonuses on Casino Games and Sports Betting!
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- ✓ Tested and certified by Casino Bonus Center · Rating: 3.9/5
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Spinarium
Claim Up to $2,250 Instantly or Enjoy a Four-Step Bonus Package
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Wolfy Casino
Enjoy up to $1,000 in Wager-Free Bonuses at Signup!
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- ✓ Rating: 3.8/5
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Top 10 Online Casino Bonuses in Japan (December 2025)
Expert-Rated Real Money Casinos with Top Bonuses
Looking for the best online casinos in Japan? Our expert team has tested and reviewed hundreds of real money gambling sites to bring you the top 10 choices for December 2025. BitStarz, Zodiac Casino, and SnatchCasino lead our rankings, standing out for their extensive selection of high-paying slots, immersive live dealer tables, exclusive bonuses, and lightning-fast payouts.
Most Popular Online Casinos in Japan
Curious which brands stand out among Japanese players right now? Here are the top 3 most popular online casinos in the last 30 days—each trusted for their excellent bonuses, diverse games, and reliable payouts:
- Gday Casino – Ranked as the #1 most popular online casino among Japanese players this month. Check why Gday Casino is so popular in Japan
- JackpotCity Casino – Holds the second spot in popularity with Japanese players for December 2025. See Current Bonuses at JackpotCity Casino
- MrGreen – Currently ranked #3 among Japan’s most played online casinos. View Available Promotions at MrGreen
Browse our expert-ranked list below and claim your exclusive welcome bonuses today!
| Online Casinos Japan | Welcome Bonus |
|---|---|
BitStarz Claim up to ¥50,000 in Bonuses | Bonus of 100% up to ¥10,000 + 180 Free Spins |
Zodiac Casino 80チャンスは億万長者になるために! | 80 Free Spins |
SnatchCasino Casino Fun, Beach Vibes, Gangster Style | Bonus of 225% up to $1,000 + 100 Free Spins |
Casumo Daily slots tournaments | Bonus of 100% up to $400 |
InterCasino 50 Free Spins — No deposit required | Bonus of 100% up to $500 |
888Casino Get a Free Spin on the Wish Wheel | Bonus of 100% up to $1,000 |
Betsson Sportsbook, casino, live casino | Bonus of 100% up to $100 + 50 Free Spins |
Grand Mondial ジャックポットが当たる150回のチャンスをゲット | 150 Free Spins |
betsafe The best games, all in a safe place | Bonus of 100% up to $200 + 200 Free Spins |
EnergyCasino Triple-Powered Welcome Bonus | Bonus of 100% up to ¥25,000 + 400 Free Spins |
* Terms & Conditions Apply · Play responsibly
With nearly two decades of experience in the industry, CasinoBonusCenter.com has been analyzing and comparing online casinos since 2006. Our dedicated team of professionals has handpicked the most trusted casinos for Japanese players to ensure you get the biggest sign-up bonuses, top-tier games, and the most rewarding loyalty programs.
