Pol.is
Although the interface is in Japanese, it seems that it also supports input in Japanese. You can see a visual representation of the tool's usage in this link(https://gyazo.com/24b9ca2e6d1fef2a75e1c9b73ad91eb0). The graph shows how the average number of responses per participant (vertical axis) changed over time (horizontal axis). Additionally, it provides information about the participation of 12 individuals, who collectively answered 127 issues, with an average of 10.58 responses per participant. There were also two additional issues, making a total of 15 issues (including those inputted by the administrator).