To the growing list of things that make gaming startup Coly Inc. unusual, it can add one of the best market debuts in recent Japanese history.

Co-founders Anna and Mizuki Nakajima — they’re twins — took their seven-year-old mobile games studio public Friday, and the stock doubled, the strongest market debut of 2021. As of Tuesday’s close, each sister’s 33.75% stake was worth ¥15.2 billion.

In both global gaming and Japanese business, Coly’s success and its 32-year-old executives stand out. Almost three-quarters of its 200 employees are women, and they’ve scored two hits with serial story lines that have kept fans — also mostly women — coming back for the next plot twist.