Robotperson engages Mushiking.
100¥ / play buys a collectable card, barcoded down one edge. You swipe the card in the reader (visible, centre of the control panel) and this selects the beetle on the card as your player.
The Japanese really know how to hook players into a game - the collectable element duplicated here is what made Pokemon such a phemonenon. Mushiking itself is basically scissors-paper-stone. You select which option you want (I've gone for paper here) and the round plays itself out. Looks like I lost this one although I became suspicious that the game was weighted to prolong play when I won about 8 in a row - far more than you'd expect through chance alone.
The cabinet is mini-sized, aimed at children - I'm sat on a low stool here. It was in a big toy store (Hakuhinkan in Shimbashi), with probably 20 other cabinets. All the other players were adult men, Mushiking-ing away their mornings.