The Star-shaped Key

Chiemi Ohka,who has another key to Raku Ichijou's pendant.
She is a girl who easily gets annoyed by people but is nice when people are in her good side.Once in her bad side you won't hear the end of it,Chiemi comes in as the new student in the same timing as Chitoge.Chiemi and Chitoge start a rivalry against each other and against Raku.Later on Chiemi finds a diary in her room hidden underneath a floorboard,picking it up she dusted the dust off.In the front of the diary it read 'Chiemi's diary (since she was a little kid)' it said in little writing.
Find out what happens in The Star-shaped key