When Ritsu was in high school, he fell in love with a boy who broke his heart, changing his view of love forever. Now a jaded adult, Ritsu has just transferred to the Marukawa Shoten company in hopes of publishing literature, only to be told that he'll be working in the shoujo manga division instead. What's worse, his boss is brash, rude and seems to have an interest in him! However, the biggest surprise is yet to come for Ritsu, as he soon discovers that his boss is none other than his lover of his past!
Having recovered from a mysterious accident that caused him to suffer amnesia, Hashiba Sora is just starting to get his life back together. On the road to recovery, his steady progress is interrupted when he acquires a new roommate (who supposedly is his childhood friend), Fujimori Sunao. Their relationship becomes even more complicated with the appearance of Ran, an alternate personality inhabiting the same body as Sunao! Faced with the shadows of his past, can Sora regain his lost memories and make sense of what is happening around him?
Though quite different plot-wise, Sekai-Ichi Hatsukoi and Sukisho both hang on an ambivalent relationship between the main characters that has its roots in painful events in adolescence. They are both enjoyable yaoi animes with a appealing mix of comedy and romance. If you like one you'll probably like the other.
If you enjoy watching two people in love with each other but not really in a relationship both of these are for you. Both have humorous interactions between the couple and both Takano and Haru are a bit excentric. Hatsukoi is a bit more serious than Tonari because of the past of the characters but both are mostly light hearted and fun. Also, both center around Shizuku's and Ritsu's internal conflicts. Both come off very romantic even with the lack of an actual relationship.