猥琐大叔纯情少女
[wĕi suŏ dà shū chún qíng shăo nǚ]
The name means 'A dirty old man and an innocent girl' which describes an ironic relationship between two contrasting character types or roles—one experienced and inappropriate; the other naive and pure-hearted. It's used in playful, humorous, or self-mocking manner.