At the start of the series (i think Episode 5 or 6), Sven teaches Eve to yell out "Tagoya" when she see's fireworks.
later when Sven suggest to launch fireworks to lure Eden off-course, hearing the fireworks go off while within Eden Eve is yelling out "Tagoya" while on an elephant ignoring Adam
I am wondering, where does this thing about yelling "Tagoya" come from?