きみとぼくの壊れた世界•

Kimi to Boku no Kowareta Sekai

The first installment of the Sekai Series. <br><br> Two siblings in the process of crossing a forbidden line, Hitsuuchi Samatoki and Hitsuuchi Yorotsuki. Two friends, Mukaezuki Hakohiko and Kotohara Ririsu. A locked-room murder at the school cracks their worlds… <br><br> (Source: Kodansha, translated)