If you liked the Strobe Edge manga, the Anime-Planet community thinks you'd like:
Yamato Akitsuki has recently moved to Tokyo, and in order to maintain his less than wealthy lifestyle, he currently works at his aunt's bathhouse. While walking by the school one evening he sees a girl by the name of Suzuka practicing the high jump, and is instantly in love. Even better is the realization that Suzuka lives next door! Determined to prove himself worthy of her affections, Yamato decides to join the school's track team and show her what he's got, but things won't be so easy; for Suzuka has a love interest of her own, and it isn't Yamato...
Similar plots: The naive main protagonist(Ninako/Hikaru) has an energetic male childhood friend(Daiki/Masato). Her female best friend(Sayu/Nene) later falls in love with him. The protagonist falls in love with a guy but she is rejected (Ren/Miki), then the best friend of that guy gets close to her(Andou/Jun). Later the first guy starts going out with her again as friends and the love triangle is formed.All characters have extremely similar personalities, and the love triangle is also very similar (the serious guy with issues, the guy who becomes a friend but teases the girl and has a hate-love relationship with her, and the goody goody protagonist) so if you like one, you´ll like another.
The basic plot's the same: Naive schoolgirl has an unrequited first love for the cool, dark-haired guy but he already has a beautiful girlfriend. However, unknown to the girl, he likes her back too? A second love interest appears as a classmate who holds an unrequited love for the main girl. Even though he knows she likes someone else, he wants the chance to be with her. The love triangle turns into a square.
The characters in both manga have depth to them and are not just the typical rival girlfriend or typical male second lead. At first, both manga seem like generic shoujos but as one reads on, they deviate from the usual formula. There's a similar pastel-like art style in both of them!
The "winning" guy of Strobe Edge is not the same as the winner of Tonari no Atashi so if you were dissatisifed with the first love/second love not ending up with the girl, try out the other manga.