I'm in Love and It's the End of the World Vol. 5 (Kodansha, 2018)

As Aoi and Mahiru move on from their first fight as boyfriend and girlfriend, Aoi's haunted by something he's never told a soul that happened between him and his late mother. But when Mayo, Mahiru's twin sister, comes to work at Aoi's cafe, she confesses her love for him…and Ginga confesses his love for Mahiru! Aoi and Mahiru set off on a date to tell each other what happened and find themselves at the park where they met for the first time…where Aoi tells Mahiru his dark secret. Watch true love blossom in the conclusion of this story of a gloomy Cinderella and her angsty Prince Charming!