I mean it's the 90s-early2000s so it's not that outdated, we used it a lot back then lol I loved paging my mom or my uncle, idk how it was in Japan but where I'm from it wasn't fast at all to send a massage through the phone, we had to spell the entire message to the operator
Next chapter is going to be a present-day interlude, where Seira is explaining how she's truly in love with this older detective and they've been planning their future together...