Ooohhh, she actually was on just short trip! Wow what a TWEEEEST! You got us really good, author!
I swear, when mangaka start new romcom serialization they receive checklist of obligatory plot points and have no right to deviate on pain of death. Last chapter author be like: Oh shit! My manga is ending, but I still didn't check "Festival fireworks" and "FMC disappearing without explanation when everything is going good" entries! Doushio? Let's combine them!