Some Like It Scorching And Miserable!

Keroro engineers some falsified invasion footage to send to Keron high command (and make some quick cash on the side) but a sudden city-wide power outage leaves this newest scheme in ruins, as Kururu conveniently forgot to save his progress. Also feeling the heat (literally) is Natsumi, without air-conditioning to beat the rising summer temperatures.

Synopsis excerpt via Kitsu.