It's called Aishiteru, and here's the whole plan.

--> A Japanese guy, Kinji Akimoto, moves to Wolverhampton, primarily to improve his English. Once he's settled in, and almost fluent in English, he bumps into a Gothic girl called Beth. They get along really well and quickly become friends, but it takes time for a real friendship to blossom as they both have trust issues.
--> They're in her bedroom one day, having a nice deep conversation, and as the room falls silent, they look each other in the eyes and share their first kiss. From that moment on they become a couple.
--> Beth's best friend Analeigh comes into town and is introduced to Kinji. Beth and Analeigh have a love/hate relationship though; she knows what Analeigh's like with a best friend's boyfriend.
--> One day, Analeigh and Kinji are getting to know each other a bit better, and Analeigh comes onto Kinji just as Beth sees them. Beth goes ballistic and doesn't talk to them for weeks.
--> Since then, Kinji and Analeigh have been ahving trouble talking without bringing up Beth and therefore having big huge arguments.
--> Analeigh feels really guilty for kissing Kinji behind Beth's back and wants to apologise, but knows how Beth is with giving forgiveness.
--> Beth is feeling merciful and forgives Analeigh, and she couldn't stay mad for long when Analeigh brought along a whole load of Flügels from Holland. Soon after that, kinji arrives and Beth greets him with a hug.
--> The three of them get tipsy on the Flügels. And the girls end up handcuffing Kinji to the bed and teasing him with Beth's chocolate pen and God knows what.
--> The morning after, Kinji wakes up in a position that looks like he's pimping the girls out. Beth's mom sees and already disapproves of him. Beth gets very annoyed and has to explain what happened the night before.
--> Beth's mom believes her and makes a joke about Kinji's "battle wounds". Beth and Analeigh "admit to being vampires" and Kinji knows it was in jest.
--> The three of them - Beth, Analeigh and Kinji - soon begin to regret that night because they don't know how they feel about one another, like who loves who?
--> They soon manage to talk things through and they're back to how things were before Analeigh came onto Kinji.
--> Happy Ending... Kind Of.