Both about two people with incurable diseases, but in one, the victim of fate is a girl, and in the other it is a guy. they have different backgrounds as well. But both shows us we should value the little time we have
Takuma and Ken both were born with issues with the same disease regarding their hearts. While Hatsukoi takes on the issue of romance more, you'll see Tori ni natta concentrates more mainly on the life and dreams of Ken. Determined to live on, fighting to stay alive aiming towards the future.