This SnapShots in Akiba site
has some anime, game, or seiyuu related snapshots
taken while walking around in the Akihabara area.
Comments to snapshots@usagi.org.
Between January 21 and March 31, 2019, there was a collaboration at
the Mita Seimenjo (三田製麺所) restaurant with
Taketatsu Ayana.
The 400 yen "Ayachi Oshimen Set" (あやち押し麺セット)
was a large piece of seaweed and one random badge of Ayana,
that gets added to whatever tsukemen you order.
There were small advertisement signs on the tables.