Yumenosuke Love♡Land(1980)

Yumenosuke and Yayoi are twin siblings.
Yayoi wants to live an ordinary life, but the problem is that her brother Yumenosuke is too gorgeous.
Yumenosuke is so confident in his appearance that he even wears girls' clothes! Wait a minute! Is that what the eldest son and the heir of the Bukouji family should be doing?
Worried about her brother's future, Yayoi transfers to Nachi High, where Yumenosuke goes to school, and gets caught up in his wild campus life, as the mischievous days begin.

(Source: Taiyoutosho, translated)