 If you liked
Amagami-san Chi no Enmusubi
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 ...then you might like
Hiiragi-san Chi no Kyuuketsu Jijou
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The stories are very similar and resemble each other greatly. Both are about MC being adopted into a family of three daughters, featuring a familiar template:
Eldest daughter who is older than MC.
Middle daughter same age as him.
Youngest daughter is younger.
The Amagami family adopted our MC in order to resolve a succession crisis caused by the family having only daughters.
The Hiiragi family had a different idea for MC, in mind... adopting him in order to literally kill him for his blood, so that their vampire daughter could stay alive.