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Kichi Ichi (吉一), or "Number One Good Fortune," is advertised as an expensive and traditional Japanese restaurant in Okinomiya. The full title on the sign is 日本料亭吉一 ( にほんりょうていきちいち・Nihon Ryōtei Kichi Ichi) where 日本 (nihon) means "Japan," 料亭 (ryōtei) is a fancy traditional Japanese restaurant.
In the Invasion of Earth episode of Tsumihoroboshi-hen, Mion, her mother Sonozaki Akane, and Kasai Tatsuyoshi meet and have dinner with Ōishi, Kumagai Katsuya, and Komiyama to discuss Ryūgū Rena.
[MENTION Ōishi meeting Akasak]
[MENTION Meeting to agree with Rika 'n Company Plans to Mess with Takano]