Looking for Manga like Fool Night/Kurosagi Corspe Delivery Service (Existentialism)

Hey there!

I've recently found out that I really enjoy manga that dabble into existentialism; my current favourites being Fool Night and Kurosagi Corpse Delivery Service.

I'm looking for recommendations for manga that are similiar to those two or deal with existentialism - preferrebly which are already released in English, no scanlations.

Here are some other, similar manga I've already read:

• The Girl from the Other Side
• Yokohama Kaidashi Kikou
• Houseki no Kuni
• Look Back
• Vagabond

My to-read list:

• Goodnight Punpun
• Planetes