THere going to be an Anime Version of Romeo and Juliet soon
Onegai Teacher or Please Teacher:
Kusanagi Kei, a high-school student living with his aunt and uncle, has an encounter with a female alien. This alien is revealed to be a new teacher at his school. Later, he is forced to marry this alien to preserve her secrets. From there, various romantically-inclined problems crop up repeatedly.
Please Twins:
Maiku Kamishiro's past has always been somewhat of a mystery to him. The only clue he has to who is family might be is an old photograph showing two young children, a boy and a girl, playing in a small pool outside of a blue house. In an attempt to find his family, he moves to this blue house and begins working as a programmer. He's living a comfortable life until the day two very different girls show up at his door, both in possession of the same photograph, and both claiming to be his twin. With no way to prove who is a relative and who is a stranger, Maiku allows both girls to move in with him until they know for sure.
Inuyasha:
Higurashi Kagome, after being pulled down a well by a demon, finds herself in Feudal Japan, where she learns that a powerful jewel has been reborn inside her body. After the jewel shatters in an attempt to retrieve it from one of the many demons who was after its power, Kagome must join forces with the half-demon Inu Yasha (also after the jewel's power) to track down the shards of the jewel before its power falls into the wrong hands.
Chobits
In the future, almost every person roams arounds with persocons, robots that look like humans and act (somewhat) like humans. However, poor Hideki, a cram student doesn't have the money for his own. He crosses a persocon in the garbage wrapped in bandages. Once he activates her, she only knows the word "Chii." As each day passes, Hideki finds out more about Chii's past and in turn Chii learns more about the world.
Love Hina
Keitaro Urashima is determined to be accepted into Tokyo University, the hardest Japanese University of all to get into, because of a promise he made to a girl when he was young... a girl whose name he can't even remember. After failing to get into Tokyo U twice, he is kicked out by his parents and goes to live with his Grandmother at her hotel, but it seems it has been turned into an all girls boarding house. What's more, much to his surprise and to the tenants disgust, Keitaro is made manager of the boarding house.
15 years ago, a young boy, Urashima Keitaro, made a promise with a girl that they will enter Toudai (Tokyo University) and find happiness together. 15 years after, he has failed his second retake of the Toudai entrance exams. One morning he recieves a call from his grandmother, Urashima Hina, to go to Hinata Lodge, the same place Keitaro had made the promise with the girl 15 years back. Upon arriving, to his surprise (or shock) Hinata Lodge is no longer an inn, but is now a all-girls dormitory. To make matters worse, he was made the manager of the dormitory against the disapprovals of all the tenants.
Only Yesterday:
Taeko Okajima is a typical "office lady" in a big company in a big city. When she takes a sabbatical to the countryside in Yamagata Prefecture, the hometown of her brother-in-law, the journey recalled her memory of her 5th grade year. During her stay in Yamagata, she works hard and happily as a farmer and is surrounded by friendly relatives and villagers, bringing up more memories. Their hospitality makes her to reconsider her choice of life.
Eureka SeveN:
Renton Thurston is a 14-year-old boy who lived with his mechanic grandfather in a backwater town. Every day he dreamed of being with the mercenary "Light Finding Operation (LFO)" aircraft pilot group "Gekkostate" and riding "Trapar" particle waves-- a sport called "reffing"-- with their charismatic leader Holland, especially when faced with his father's acclaimed past or his grandfather's desire to protect him. When a young girl named Eureka riding the original LFO, the "Nirvash typeZERO", asks his grandfather for a tune-up, she inadvertently brings the attention of the military to the garage; as a result, the garage is destroyed and Renton is forced to deliver a new type of interface-- the "Amita Drive"-- to the Nirvash. After a heated fight in which the Nirvash destroys the military LFOs by unleashing an immense amount of power, Renton is invited into Gekkostate. However, he quickly realizes that behind the facade of a traveling group of mercenaries is a very bitter reality.
Mobile Suit Gundam:8th Ms Team:
Plot Summary: U.C. 0079 - In the middle of the One Year War, Ensign Shiro Amada is transferred to South East Asia to command Kojima Batallion's 08th MS Team, a small army of soldiers piloting RX-79[G] Gundam Ground type units. During the skirmishes in the jungle, he confronts ace Zeon pilot Norris Packard and falls in love with Aina Sahalin, a pilot involved in testing Zeon's top-secret mobile armor. This relationship leads to the Federation doubting their trust in Shiro. Now Shiro must prove his loyalty in the battleground or die a traitor.
Gundam 0083:
U.C. 0083 - Three years after the end of the catastrophic One Year War, peace on Earth and the colonies is shattered by the presence of the Delaz Fleet, a rogue Zeon military group loyal to the ideals of the late dictator Gihren Zabi. Delaz Fleet's ace pilot Anavel Gato, once hailed as "The Nightmare of Solomon", infiltrates the Federation's Torrington base in Australia and steals the nuclear-armed Gundam GP02A "Physalis" prototype. Rookie pilot Kou Uraki - with the aid of Anaheim Electronics engineer Nina Purpleton and the crew of the carrier Albion - pilots the Gundam GP01 "Zephyranthes" prototype in an attempt to recover the stolen Gundam unit and prevent another war from breaking out.
Kujibiki Unbalance(OVA)
Chihiro Enomoto is a freshman that just got to a new school called Rikkyoin High School. He lost his parents in a traffic accidents when he was 10. Since then, he has been living only with his elder sister Shinobu. He is good at cooking and cleaning, and does all the housekeeping jobs. He fell in love with Tokino (orange hair) at the first sight when he met her in the school library on the first day of school. Another girl named Ritsuko (the big yellow helmet), childhood friend of Chihiro and the chair of student council, falls in the love with the boy instantly after this long-awaited reunion. But she is not the only one who is in love with him. This is the story about a one-year campaign among the candidates for the next students government leaders, who are also chosen by the lot (kujibiki), in order to gain the position.
Kujibiki Unbalance Tv:
Once a year prestigious Rikkyouin High School has a lottery to determine the next year's Student Council membership. On their first day of school Chihiro Enomoto wins the presidency while his childhood friend Tokino Akiyama picks the vice-president's ticket. There is one catch though, they must first pass a one year apprenticeship under the current Student Council and any failure to perform the tasks assigned, however minor, will result in immediate expulsion from the school.
This Ugly Yet Beutiful World:
High school student Takeru Takemoto works part time as a (motor)bike courier. During one of his deliveries, he saw a mysterious light passing him and fell into a forest. What he had found was a beautiful girl coming out from a glowing cocoon, calling herself "Hikari." While Takeru was quite embarrassed because of Hikari's nudity, a strange monster suddenly showed up and immediately attacked the two. Both Takeru and Hikari demonstrated the power of their other selves before Takeru had a clue of what's going on.
Genshiken
This is the story of college freshman Kanji Sasahara and his fellow members of the college club he joins, The Society for the Study of Modern Visual Culture (aka Genshiken), as he goes shopping for doujinshi, attends conventions and slowly but surely makes his way down the road to fandom.
Voice of a Distant Star"
a female mecha pilot tries to keep in touch with her boyfriend on earth while she is in space using cell phone text messages. The farther away they get from each other, the harder it is for the text messages to get to each other.
Happy Lesson:
Hitotose Chitose was always alone and untrusting of people but when 5 female teachers appear and started living together with him in his family's house as his mothers, things started to change and pick up, together with Hazuki-nee and Minazuki (his 2 sisters) everyday is a lesson
There are alot of romantic anime series out there. My best advice would be to go to the website listed in the source and check em out.