->''"Senna, we can make pleasent memories anytime anywhere."''
-->-- '''Junna'''

->''"You don't remember them because they are the memories that you need to forget Onii-chan.."''
-->-- '''Senna'''

->''"Everything that Senna did... she did for my sake..."''
-->-- '''Junna'''

''W~Wish~'' (pronounced ''Double Wish'') is about a boy, Junna Tōno (遠野潤和, Tōno Junna), who has a twin sister named Senna Tōno (遠野泉奈, Tōno Senna). He is an OrdinaryHighSchoolStudent at Sakurahama Private High School happily living with his twin. However, in the past, a traffic accident deprived him of his parents and his memory. Junna survived the accident and since then, he lived only with his sister alone in a house. Senna and Junna support and rely on each other, and due to this Senna is very fond of her Onii-chan.

Junna's present life with Senna at the same high school is so pleasant that he can forget his severe past. However, Junna begins to recall the memories he lost in the accident. He enjoys the happy and pleasant days, but he is tossed by his past, his present, and his future.

Then one day a girl [[NewTransferStudent transfers]] named Haruhi Inohara (井ノ原春陽, Inohara Haruhi) who claimed to be his childhood friend but later as his younger sister who he suddenly remembers. Who is his actual sister, Haruhi or Senna?
What is the truth hidden in his memory?

[[AnimatedAdaptation Adapted]] [[AnimeOfTheGame from a]] Princess Soft VisualNovel, it consists of [[ThirteenEpisodeAnime 13 half-length episodes]] which aired alongside ''VisualNovel/FinalApproach'' (also from Princess Soft) during the "Princess Hour."

!! ''W~Wish~'' provides examples of:

* BittersweetEnding : [[spoiler:Senna wished that she continue to exist as Junna's sister, Junna wished for Senna and Haruhi to exist, and Haruhi wished to be Junna's childhood friend. To compromise all three, Haruhi becomes Junna's childhood friend while Junna's parents become pregnant with a new child that they plan to name Senna.]]
* BrotherSisterIncest: Played with [[spoiler:Haruhi definitely is in love with Junna and the entire reason she wishes to become Junna's childhood friend is because you can't marry your brother. Her wish is granted making her no longer his sister.]]
** It doesn't help that Senna also gets visibly jealous of girls who get close to her brother.
* CurtainsMatchTheWindow
* CuteClumsyGirl: Sana.
* [[spoiler:DeadToBeginWith: Senna.]]
* [[spoiler:DeathByChildbirth: Senna.]]
* DontSplitUsUp: [[spoiler:Senna was supposed to be Junna's twin sister in the real world, but since she died at childbirth she doesn't exist. Should Junna wish to return to the real world, Senna would disappear.]]
* EvenTheGuysWantHim: Junna.
* EveryGirlIsCuterWithHairDecs: Senna in the maid costume.
* [[spoiler:EveryoneIsRelated: It's eventually revealed that Haruhi is actually Junna's sister. Which means all three are siblings.]]
* HadakaApron: Haruhi wears one in the specials, and so does Tomo.
* [[LukeIAmYourFather Junna I Am Your Sister]]
* TheKlutz: Sana.
* [[spoiler:LongLostRelative: Haruhi.]]
* MindScrew
* RelativeError: Senna's attachment to Junna can easily show this.
* TheReveal: [[spoiler:Haruhi is actually Junna's sister and Senna doesn't exist.]]
* YouGottaHaveBlueHair: Haruhi.