The story begins by introducing Haruka Suzumiya, Akane Suzumiya, Takayuki Narumi, Mitsuki Hayase and Shinji Taira. Mitsuki sets Takayuki up with the shy Haruka and they begin to date each other, out of sympathy or other reasons involving Mitsuki and her deep friendship with Haruka. Despite having such problems occur, Takayuki and Haruka eventually develop an intimate relationship � just as Takayuki and Mitsuki start realizing their feelings for one another.

One day, Takayuki is running late on his way to meeting up with Haruka. This turns into tragedy when Haruka becomes involved in a very serious automobile accident and as a result falls into a coma.

-Wiki