It's quieter than usual in the Hinata house, as only Giroro and Natsumi are at home. When Natsumi goes to check on Giroro, she is somehow whisked away to 1870's Paris- and to the Opera House of the Phantom of the Opera. Even worse, Natsumi ends up getting mistaken for Christine Daae! But when Natsumi actually meets the Phantom, it becomes clear that he might not be what he appears.

The Keroro platoon has come up with a new invasion tool: Reincarnation! But what happens when Natsumi is affected? What happens when Giroro's past life isn't what they thought it would be? GiroNatsu, with hints of ChristineXErik... you'll understand what I mean. Rated for mild swearing.