Wow this seems to be connecting!

Story 1 Lovers of the Crimson Night- LAZINESS/SLOTH (theyve become bored of immortality and don't want to live anymore so they just play a game with their death)

Story 2: Riri's Bubble Ice Cream- GLUTTONY
(girl cant get contented with her current "ideal" man and keeps coveting for more, hence she keeps eating the ice cream)

Story 3: Love Frequency - ENVY (girl is determined to think bad of her bf and so gets jealous no matter what, hindering true happiness)

Story 4: Ant that fell from the High Rise- PRIDE ( the lady is too proud of her life status and kept looking down on the handsome janitor's state of life so she failed to recognize they loved each other and took him for granted.)

Story 5: Orange Scandal- LUST (all 3 of them are entertaining lustful thoughts because of the orange and there hasnt been an actual sex but many scenes of it imagined already)

Now all that's left are GREED and ANGER, although technically we can see overlaps of themes of the 7 deadly sins across all the stories so far...