The one month of freedom. The one month of warmth that Shiki felt to Haruna. The one month of happiness for Shiki. Those moments they had during the month they had was bittersweet. This manga has to much sadness. All I can say is I wish the "in another lifetime" for them, a happy ending for them. ╥﹏╥
There's still some extra 2 chapters before it ends, I think. Based on the table of contents in the manga.
http://www.mangago.zone/read-manga/ichinose_kun_wa_itsumo_iinari/uu/ibx_chapter-1/pg-3/
CLIFFHANGERSSSS!! (╯°Д °)╯╧╧