I'm in Love and It's the End of the World #2

Plot

Growing up in her pretty, popular twin sister’s shadow, Mahiru Yanase’s always known she’s the other Yanase. She’s a gloomy girl who’s convinced that every time something good happens to her, something bad happens to balance it out. So when Aoi Satomi asks her out just moments after meeting her, she can’t bring herself to believe his feelings are true—even if she does feel herself starting to fall for him. When she finally admits to Aoi that she’s hesitant, he makes a shocking claim: that he first met Mahiru a long time ago! Then he asks her out again and pulls her in for a kiss… Things are moving awfully quickly for Mahiru in Volume 2! What will she do?!