I plan to watch these series in the coming weeks and I think it will be the first production I have ever watched from the Philippines. I like the fact it explores dark topics because there aren't many good animations that belong to the suspense-mystery genres.
I think you might be interested in checking out 2 anime series that I have enjoyed a lot and explore what could be considered as "dark" or "mysterious" topics. One is called Another and it is from 2012, and the other one is called Serial Experiments Lain, and it is from the 90s. There is also another series called When They Cry that I enjoyed very much but a lot of its scenes are childish and immature, which might reduce the seriousness of the production although that didn't prevent me from considering it a worth watching series.
Yeah, I'm like you, I think this was my first production from the Philippines, I can't remember if I saw another one before. I liked that too, it's too dark at some points, it won't let you down.
I love 'Another' and 'Serial Experimental Lain', I watched them a few years ago and I was amazed, there's nothing like those animes. Thank you for reminding me of them! I didn't hear about it, but I'm gonna look something about 'When they Cry', and I know that feeling when something childish doesn't let us enjoy something. Thank you!!