ive been reading a manga called wind up tina, its very cuet. theres a frog girl named kaeru hime ヽ(´∇`)ノ its about a world where everything is wind-up, but then a traveler who doesnt have a wind up key shows up. its pretty simple still though.

theres also the mahoujin guru guru mangas, and chibi maruko-chan. and kero kero chime. a lot of ribon mascot comics are very good. theres also mato-chan which is a little odd slice of life about a loli who LOVES bugs ヽ(´∇`)ノ ! and theres a sequal called chiro-chan

all of these shouldnt be too hard, especially stuff from ribon mascot comics as i think a lot of those have furigana (ﾟー｀)