Lucy is an alien girl who doesn't have much expression and doesn't have any friends. In the anime, she introduces herself to Takaki's class as 'Ruuko Kirei na Sora', which means 'beautiful sky.' She meets Takaki in the sixth episode of the anime, but we see her in an earlier episode without any dialog. She refers to herself as 'Ru', the name of her home planet and the beings on it, and to earth and earthlings as 'Uu'. She greets people by reaching for the sky and saying, 'Ru!' Himeyuri Sango in particular enjoys mimicking Lucy's greeting. Lucy has a cat that almost drowns in the sixth episode but it is saved with the help of Takaaki; Lucy summons a thunderbolt which splits a tree, forming a bridge which Takaaki crosses to lift the cat out of a raging river. Lucy terms this stray cat 'the Nya', saying that it is a special species that can enjoy the true taste of food, and like Ru, Nya is alone on Uu. Lucy likes to cook the Nya fish broiled over a charcoal clay pot, which according to her is the best cooking device available on Uu. Apparently a currency of Ru is matchsticks, one of which is enough to buy a whole rocket engine. Lucy irritates the cafeteria cook of Takaaki's school by attempting to treat Takaaki to the best meal the cook can prepare by paying the cook first one, then two matchsticks, however Lucy is somehow able to successfully purchase her charcoal clay pot and fish to br with matchsticks. Lucy says that on Ru, it is said that the only good Uu is a dead Uu, but Takaaki is a special Uu.

Following her graduation from middle school, Konomi Yuzuhara enters the same high school as Takaaki Kono, her childhood friend. As the new school year begins, they meet their childhood friend Tamaki Kosaka, as well as many new accquaintances. Unbeknownst to the group, their encounters with each other will soon lead to many memorable adventures.
 
(Source: Anime News Network)


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__Non-anime roles:__~!Lucy Maria Misora in all "To Heart 2" (Visual Novel)
 Sion Eltnam Atlasia in Melty Blood (Video game)!~

The first and the second volume will feature Komaki Manaka and Kusakabe Yuuki, respectively.

Based on the Visual Novel ToHeart 2 AD (Another Days), the sequel to ToHeart 2.

Volume 1 
Silfa the robot maid is currently working at Takaaki's house. However, she seems to have a little trouble with her duties as part of it involves going out in public to buy groceries, and she's a bit "shy" in a sense. But when it comes to Haruka Yuzuhara's special curry, she'll do what she has to in order to make this special dish for Takaaki. And that includes some competition from Milfa (Harumi). 
Volume 2 
Involves summer, swimsuits and photography. 
(Source: AniDB)

According to Amazon Japan, a two-volume OVA series "ToHeart 2 Dungeon Travelers" was announced.  "ToHeart 2 Dungeon Travelers" is an RPG game on PlayStaion Portable released in 2011.

A collection of stories involving the girls of To Heart 2, with each episode focusing on a different character.
 
(Source: Anime News Network)