School Days, H2O: Footprints in the Sand Recommendations
both show the difficulties of love, love triangles and other things (such as bullying) as well as dark secrets. however, school days is much more twisted and psychological.
It has a bit of the similar storyline, harem and it's funny but at the same time suspenseful
It had this very morbid vibe to it and at most parts it left me with the same impression as school days. I know this isnt the very "common" recommendation but there was this strangeness that both shows have in common.