Rainbet’s Blask Index in Japan grew 50 times over in June 2026, moving the brand from 16th to first place with a 27.95% BAP share and overtaking Stake, the largest single-month jump Blask has recorded in the market, driven by streamer partnerships and a Kick sponsorship deal.
In June 2026, Rainbet moved from 16th to first place in Japan. Blask Index for the brand grew 50x in a single month — the largest single-month jump Blask has recorded in Japan iGaming market 2026.
What triggered the growth
Japan has become one of Rainbet’s key growth markets, supported by a strong local audience presence and a creator-driven acquisition strategy. The brand’s streaming roster — Adin Ross, Cheesur, Konvy — built that audience through Japan’s gambling-heavy creator culture, where streaming is one of the only effective promotion channels left after the September 2025 ad ban.
Activity in May–June was supported by sporting events: the UEFA Champions League Final on 30 May, the Japanese Derby, and the start of the NPB season. On 10 June, Rainbet also announced the first official category-level sponsorship on Kick — the streaming platform co-founded by Stake’s own founders — placing its brand in front of an audience already built around its main competitor.
The June surge pushed Japan to Rainbet’s fifth-largest market by CEB, behind the US and Canada. Japan’s market top is undergoing a structural reversal: most first-tier brands are recording double-digit YoY declines.
Japan’s ad ban leaves streaming as the only real channel
Japanese iGaming remains an offshore market: all 92 active brands which Blask tracks as of July 2026 operate without a local licence. Online casinos are illegal, and advertising and bonuses have been banned since September 2025. Against this backdrop, the streaming channel is one of the few that genuinely works.
FAQ
How much did Rainbet’s demand grow in Japan?
Rainbet’s Blask Index grew 50 times over in June 2026 alone, the largest single-month jump Blask has recorded in Japan, lifting the brand from 16th to first place with a 27.95% BAP share.
Why is streaming the main marketing channel for iGaming brands in Japan?
Japan banned gambling advertising and bonuses in September 2025, leaving streaming as one of the few channels that still works. Rainbet built its Japanese audience through streamers Adin Ross, Cheesur and Konvy and a June 2026 Kick sponsorship deal.
Is online gambling legal in Japan?
No. All 92 active iGaming brands Blask tracks in Japan as of July 2026 operate without a local license, since online casinos remain illegal in the country and advertising has been banned since September 2025.