Build is based on the well Higurashi Kagome uses to time travel in the anime, Inuyasha.

+ the well's inside is designed to bend horizontally, after a few blocks, leading to hallway with the same block palette as the vertical part of the inner well, and finally leads to a portal section
+ player gets out of the well through a slime block launcher
+ hallway-section /vertical-well-imitation can be made longer for a better effect

build palette is inspired from numerous other Japanese styled mc builds that uses acacia wood + dark prismarine

images I used the most as references from Inuyasha, can be seen here:

the outside:


for the roof:


the inside: