The Man Who Doesn't Stay in Memories

Kaiba and Vanilla find themselves on the weird underwater planet Nene and they later go to check out the moon. It isn't long before Vanilla finds out that they are wanted, for being involved, in the explosion on Lolo. Later on Kaiba looks into the memories of Gel, which he copied and it is then he discovers that Gel is Neiro and is also responsible for the explosions.