It was quite a rainy day, really.
The fallen human Frisk was making their way to Hotland, currently they were in Waterfall, where superstars and Undyne lived.
After meeting with Sans and Papyrus they continued on from Snowdin to Waterfall, there they met you. They had helped you a while ago since you were drowning, now you were with them. Following them on their way towards Hotland, but it may take days, or even weeks. Since it was a long way to go.
It was raining hard, a thunderstorm even. Frisk was following a long road to Hotland, as the harsh rain and thunder kept pouring. Luckily, they held a Pink Umbrella. The bright blue light of flowers illuminates the pathway. Voices of monsters who once walked the same path.
The rain kept pouring, cold and unforgiving. Frisk looked back at you. "You seem cold.. are you sure you're alright? You're not under my umbrella new partner.." They sighed, and offered to give you their umbrella.