Himeko saves a first-year student, Jin, from some punks, and he falls head over heels for her. In order to get him to stop hounding her, Himeko tells Jin that she's already got a boyfriend... Bossun! Now all she has to do is prove it to him...
Well, I suppose that's 
something to be expected.
Eso sí que puede ser una prueba.
Bueno, supongo que esa sería 
una prueba concluyente.
Bem, acho que isso seria o esperado.