How to finish Neon Red, Yellow and Violet Relationship

[ShinTheLast]

i finished the game and got the 1st ending but then i saw the 2nd option so I after i finished i went to get the remaining gifts and got the achievement for it and So for I finished Mikey, Raz & Green. I havent finished Red, Yellow and Violet but i finished the game. This game is so good that i actually wanna FC this game i had fun with the game and Story. But i need help on how to complete these Relationships.