- What kind of munition does Karin's gun use? By the looks it's a normal pistol round (possibly a .32 ACP or a 9mm Parabellum), but the weight of the round that gets transported from the future is given as exactly 60 grams, more in line with the .50 BMG round.
- Exactly what she uses for the DMC is unclear, though when she was prepared to kill Junta, it's mentioned she would use a 9mm bullet and the DMC size is shown next to it, which seems much smaller.
- When Karin went to take down Ryuuji, why didn't she just shoot him?
- Yokomori tells her to "leave Ryuuji alone, he won't cause any problems", meaning his actions weren't going to have a big impact on the future. She only goes to him because she thinks Junta isn't strong to defeat him in a duel despite training, so she wants to take care of it himself. And while Karen was willing to kill Junta in an early chapter, that was because she had caused the Mega Playboy to appear instead of avoiding it, so keeping him alive was not going to solve anything, so killing him was a more extreme but working method than altering his DNA.
- In the ending, Junta's memories and the playboy DNA in him is removed, thus he forgets about Karin and it's implied that he and Ami will end up together. But what about Ami? She wasn't hit with any kind of DMC, so she should remember the blue-haired time-traveller and all the weird things that have been going on. Wouldn't she mention Karin to Junta at some point, wondering why he forgot about her?
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