Katakoi Denshaรถไฟสายรัก; 单恋电车; 片恋電車

From Chibi Manga: She's always taking the same train when she goes to school and in that train there's a boy with such a beautiful smile. She doesn't know in what school he goes but she's so attracted by his smile. And one day, the train suddenly stopped. That's the start of their love. You will see the first steps of a love between adolescents.