Oyajina!

All the high-school girls in town wake up one morning transformed into old men...followed by some pretty awkward situations where they fall in love with each other. Are they lesbians? Gay? Or is this a fujoshi's dream come true? In the Oyajina! series: V.1 - Chinatsu to Tomoe no Baai V.2 - Ryuu to Murasaki no Miya no Baai V.3 - Oyajina! - Otaku no Shiro-chan no Baai