Suddenly My Stepsister!?

Sinopse em inglês

Our protagonist has done his best to try and gain the attention of the school’s most popular girl, but in the process, he’s broken the heart of a classmate that he deemed as 'boring.' However, when his mother remarries, he now has an incredibly cute stepsister who turns out to be that boring girl he wasn’t interested in! Why is she hiding her true identity?