Invaders of the Rokujouma!?

Season 1, Episode 11: Someday, With Them...

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Kiriha invites Koutarou to an amusement park that she had been to before. Sanae and the other trails the couple as they spot a rhinoceros beetle hero show. Ruth disappears and wacky highjinks ensue. Kirito and Koutarou get on a Ferris wheel, where Koutarou hears the true purpose of her invasion and the story of her first love, but then earth starts to rumble...