Oyajina! is a Boys' Love series which was serialized in Opera magazine from 2010 to 2011 and created by Hiiragi Nozomu.
For some reason or another (probably chemical pollution), all the female teenagers in town have been turned into middle-aged men. Friends and classmates are suddenly finding each other attractive and fall in love.
This manga contains
- Love Triangle: In the first volume we have this love square: Setsu has a crush on Ushio who likes Tomoe who likes Chinatsu who likes Tomoe. In the second volume, there's one with Haishima, Ryuu, and Shinomiya.
- One-Gender School: The "girls" go to one, while Misoji, Satou, Shouyuya, Ushio, and Kuni go to another one.
- Porn Stache: A lot of the other girls get one when they are transformed into men, but Daniella's stands out since she gets a truly magnificent one.
- Super-Deformed: Tama's mom switches between mom mode and Chibi Mode, while Tama-chan's male form is always this. The other characters are usually only Super-Deformed on title pages and volume covers.