Mononofus got excited at the piano.

Last weekend, MCZ held a Valentine's Day event at "Saitama Super Arena" in Saitama Prefecture.

A street piano was set up in the East-West Free Passage of Saitama Shin-Toshin Station, the closest station to the arena. (Unfortunately, it was set up for three months, but it will be closed today.)

On the day of the event, it seems that Mononofus continued to play MCZ's songs, as they should have.

Some of them were posted on Twitter.

We're so happy to see the wonderful joint performance of "Konouta" and the excited Mononofus.