The setting was a magic academy. The male lead was very weak. The female lead was the best in the whole academy. During the first chapter, the male lead turned into a bird then bumped into the female lead while she was changing. The series was very ecchi. There's also another female character who was very perverted towards the female lead and quite angry at the male lead.

I'm not sure but maybe Rakudai Kishi no Eiyuutan?