Oh this just hits Kamishiro deeply down, something similar had happened to him... Right?
"Each world has their own basic rules and stories," Kamishiro continued, "Going into another world does not exactly mean they would be suffering the same events from your world, depending on their actual serie of events and rules."
"...Like when..." Neptune was about to say something, but he dropped it, "Nevermind..."
"What you're looking for should be still in your own world and universe," Kamishiro then said nonchalantly, "But in another alternative timeline instead."
"But wouldn't... timelines and worlds overlap and cause something... like memories from the other universe?" Neptune asked, "Something like this... Happened once... I think."
"We don't need to overcomplicate it right?" Soleil laughed nervously, "But it's not bad to be a little selfish sometimes..."
"... Right," he nodded shyly.
"... This world here had suffered something similar before,"Kamishiro continued, "It was at the verge of being destroyed when someone managed to escape and change fate by using a wicked Digimental. But the price paid was... the hero from that time took the role of the villain he was trying to beat."
Neptune had heard that story before from Kamishiro and the others though...
"I came from that erased reality, and I understand the feeling of... wanting to see those people again. They're safe in this new reality, even if some of them don't know who I am, or I had to restart from zero with them."
He remained calm despite the sad tragic story. Maybe this could sound as Arsenemon's way to show empathy for others with a similar pain as his.
