As soon as he entered high school, the first year student Koshiyama Shiki was invited to the mysterious Quiz Study Group led by his senpai. What will Shiki run into when being dragged along by his class mate Mari into the dazzling world of...

Michi and her family have just moved into the Happiness House, a huge tree with all sorts of little buildings and houses built on and inside of it. Upon exploring what is to be her new bedroom, Michi finds an odd nut-like object. Before long, a...