"At first, Takayuki Narumi is befriended by Mitsuki Hayase only because Mitsuki's best friend, Haruka Suzumiya has a crush on him; however since then, Takayuki, his pal Shinji Taira, and Mitsuki have grown to be the best of friends. Then one day, Haruka confesses to Takayuki her love for him. Not wanting to hurt her feelings, Takayuki agrees to go out with her. After a few incidents, their relationship gets intimate, even while Takayuki and Mitsuki begin to realize their feelings for each other. But suddenly, when tragedy strikes, things are never the same for these four friends again."
Source: ANN
The anime adaptation is also called "Kimi Ga Nozomu Eien" or "Rumbling Hearts"".
"After Haruka Suzumiya got out from the hospital from her three years of coma. She moved back to with her parents and continued to date Takayuki Narumi. She wanted to see her old friend Mitsuki Hayase who Takayuki Narumi dated while she was in coma."
This OVA presents an alternate ending compared to the series and hereafter.
"A spin-off show from Kimi ga Nozomu Eien. It's about the daily adventures of Ayu and Mayu, the two waitresses from Sky Temple and they do some comedy stuff"
"Jouji Gouda is a new transfer student at Hakuryo High. He fell in love at first sight and boldly proposed to Akane Suzumiya, representative of his class, on his first day at the new school. Although Akane finds him very annoying, hot-blooded and simple-minded Jouji never gives up and would do anything to express his love towards Akane."
Source: ANN
The anime adaptation is also called "Akane Maniax".