Kokoro Botan. Koga Eito from the special class helps Kasuga Niina from her poor health during the high school entrance ceremony. Niina is captivated by his gentle manner, which makes her confess her feeling towards him. Therefore, this couple's struggles in love begin. When time passes on, Niina finds it difficult to continue to love him, because there are times where he appears to be playing with her feelings. To her, going out with Koga could bring her a grim future.