Yosuga no Sora: In Solitude, Where We Are Least Alone., Mashiro-iro Symphony: The Color of Lovers Recommendations
just when you though the main character will like this person, it changes to the other, but yosuga transfer in many direction of relationship.
this anime really reminds me of Yosuga no Sora.especially the main girl
both the main girls have same attitude.
both anime the main male character's sister wants more attention and feel jealous if they talk to any other female.
both of them main female characters think deeply.
if you like on then you will definitely like another.
They are both anime where the main guy likes the main girls (well duh). But the main guy has a sister and ends up with her in one of the splits, yosuga no sora is in an omnibus format which means you get to see all the possible outcomes!
Boh have harem spice
Both has triangel love
Both similar school setting