I went to Mishima Plaza Hotel's summer family buffet.
Although it was a reasonable price, the food was substantial and very good.
Also, the end time was early at 19:00, so I was able to visit Mishima Taisha shrine for the summer festival afterwards, and it was a very meaningful day.
The next date of the family buffet is undecided, but if it is popular, I think that it will be held next year, if you are interested, please refer to the homepage of Mishima Plaza Hotel. It was one of the presidents above.