Ichibanboshi Kirari

From Chibi Manga: His touch isn't gentle...Sensei lives within the depth of my heart. Riri is taking a high school entrance exam on an island of 300 people. A boy saves Riri while she is filled with worries. Wanting to see him again, Riri is determined to try her best in this new place, but all the students are afraid of him and call him scary...!? A love with a very serious sensei!