Sanae doesn't realize she'll possibly never see Renko and Han again~
... I feel she still hasn't realized that neither she came from the early future too (since that's the setting from most renko and maribel works), or that renko and maribel are from the present times instead?... Or maybe that, in renko and merry's eyes, Sanae's cellphone would have been neither "old", or maybe Sanae just like retro things?...
I guess you never see cellphones, huh?You can even take pictures ... these are my friends --Oh, it's working ...I see, Nitori-san must have fixed it ...Hm?But this is broken, so it won't w-...Oh, this is called a cell phone. It lets you talk with people who are far away.