Game developers mostly saw a limited impact of the ban in June on the "complete gacha" sales method used by online gaming sites, according to their quarterly earnings results.
The sales method, in which players are rewarded with a special rare item for collecting a complete set of items obtained randomly, incurred the government clampdown over complaints that it induces players, including children, to run up exorbitant bills.
Social game site operator Gree Inc. saw its sales and operating profit in the April-June period drop from the previous quarter, but Chief Executive Officer Yoshikazu Tanaka said the company thinks it is difficult to gauge the direct impact of the ban.