DearS

In the near future, a UFO crash in Tokyo reveals the existence of aliens to
the world. The stranded aliens, who come to be known as DearS, look and act
much like humans, but come from a very different society. Though contact with
their homeworld is soon reestablished, many DearS remain on Earth, joining
human society.

DearS is a visual novel & relationship simulation game based on the manga
created by Peach-Pit. The player is cast as high-school student Takeya
Ikuhara, who until recently was living alone, but has had two young, female
DearS move in with him: Ren and Tina, who view Takeya as their master.

The game is broken up into days, with different actions and locations
available depending on the time of day and the day of the week. The player
must interact with different characters to proceed through the story and
further the relationships with each character. In particular, Ren and Tina can
be given both presents and orders — such as to cook dinner, or read a book —
which will increase their attributes and their affection towards Takeya.
Depending on the player’s actions, different events will occur, and the
ultimate goal is to reach each character’s “good ending”.