Miitomo, Nintendo's very first experiment for mobile devices, has closed its door. The service has ended, and there's nothing more left to see. Nintendo shared the following message for the closure of the app.
We want to thank you for enjoying Miitomo so much. Miitomo’s service has come to an end as of Wednesday 9th May 2018, 16:00 (JST). We’ve come a long way since the app was launched, and once again we want to thank everyone who’s been involved. We hope to go on to even bigger and better things in the future with Nintendo, and we hope you’re there to share the fun. We hope to see you again soon!