Miki Watanabe first opened an izakaya restaurant under the Tsubohachi franchise in 1984.

[2] Mina Mori, a 26-year-old employee of its namesake restaurant chain, committed suicide[3] two months after joining the company in 2008.

Her family lodged a complaint with the Yokosuka Labor Standards Office to seek recognition of the suicide as work-related.

When their claim was denied, they appealed it to the Kanagawa Prefectural Labor Bureau, which recognized work-related stress as the cause of the decline of her mental health.

[9][10] At the end of 2023, it announced that it would be acquiring Singapore-based Leader Food and two related companies, Leader Food Industries and Premium Seafood Supplies, in its first overseas acquisition for S$9.2 million in exchange of 80% stakes in the three companies, to augment its international supply chain.