Well, I guess he's reached that point that he starts doing the Japanese musical band trope: of not releasing something/staying quiet for a long time and after 5years or even a decade they come to fans like "Oh yeah we're still active"
Then a Quadrifoglio song with the chorus singer singing Kanako Ito's part. [EDIT I think it was "Pineal" from Quadrifoligo 2]
The entire show was about 2 hours long.
After the end Eiko Shimamiya called everyone back to their seats for a photo then signed copies of Quadrifoglio 2 along with the other 2 members present and Asuka (IVE Sound) autographed a copy of the CD "exchange" (Eiko Shimamiya and Asuka) for me.