This coin is almost exactly what you were thinking.
It's a commemorative medal sold at a souvenir shop rather than a night shop.
This coin is a fantasy coin called "Fukusen" made at a famous temple called "Tsurugaoka Hachimangu" in Japan. "Fukusen" is similar to "Esen", but it is new in the era, probably made about 40 to 50 years ago ... I think it was made in the "Showa" period. It is a talisman and a commemorative souvenir for those who visit the temple.
