As a student, Frisk ran close to Ybote Mountain to escape the rain, but unexpectedly he accidentally came to the underground world and lost control of himself. Through God's perspective, he saw a lot and met a lot of interesting "people".
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In short, it must be he in the end, right...?
*Sf direction, there may be lambs and chara?
*The writing is terrible, please be careful to avoid lightning
Intent: undertale fan