This is a bicycle to ride on it with 2 adults. It is good when you cycle with a person who is vision-impaired or not good at cycling.
You must be careful that it is not ascribed as a normal bicycle. This is different from a bicycle for a person or with parent and child.
For example, there is written the word “except a bicycle(自転車を除く)” on the traffic sign, a normal bicycle is excepted from that regulation. But with tandem bike, you need to comply with the regulation because it is removed from normal bicycle.
As it has many restrictions, you may enjoy it if you restrict usage such as easygoing cycling on a promenade along Kamogawa riverside.