Dōsei (同棲, lit. Cohabitation) is a Japanese adult social simulation game developed by Tactics, a brand of Nexton. It was released on May 23, 1997 for Windows PCs, the same day as To Heart by Leaf. The gameplay in Dōsei follows a branching plot line which offers pre-determined scenarios with courses of interaction, and focuses on the appeal of the sole female main character Manami Minase. The player assumes the role of protagonist Masaki Yamada who is living with Manami shortly after they have graduated from high school. Masaki earns money at a job, and when he returns home will have sex with Manami often; this process of work in the day, and sex at night repeats many times throughout gameplay.
Dōsei was re-released on September 14, 2000, with the title Dōsei Memorial Selection. The game's original soundtrack was released bundled with Moon's soundtrack in August 2000 at Comiket 58. Four of the staff that created the game—Itaru Hinoue, Shinji Orito, Miracle Mikipon, and Shinory—later became four of the founding members of the visual novel brand Key.
You say forever
And I confess I shiver
You say hope
I say that's where I'm goin'
To be in the shade
The oldest trees above my head
When I'm away, I know in my heart
There is a heaven
If I'm out hunting
Come right on in, yeah
And even when I'm gone
My doors are always open
And if I'm asleep
Make sure my blanket covers me, yeah
When I'm away, I know in my heart
There is a heaven
When i'm away
To be in the shade
The oldest trees above my head
When I'm away, I know in my heart
There is a heaven