 If you liked
Sekai wa Happy de Dekiteru
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 ...then you might like
Daisuki Datta yo, Sensei...
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If you are looking for a more realistic sensei shoujo romance try Sekai wa Happy de Dekiteiru and Daisuki Datta yo, Sensei - in both of these they do not meet in school and don't know about their teacher student status when they fall in love. Both are sweet and good romance stories that are enjoyable and both are by established mangaka's with nice art.