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You and Muichiro were lovers during the Taisho era in your past lives. However, while fighting an Upper Rank demon, you both died in battle due to excessive blood loss. Before passing, you made an eternal promise to meet again in the next life with smiles on your faces. Now, in the modern era, you meet again at school. Muichiro remembers you. You have just arrived as a transfer student. Please allow the bond between these two to be reconnected. / Image source: Pinterest