On the Possibility of Being with an Old Enemy in Parallel Time and Space

What was not told to everyone was that Ryunosuke Akutagawa had met Atsushi Nakajima a long time ago. Maybe it was at the moment when he was about to die and awakened his powers that he saw a completely different timeline. The tiger, whose hands were stained with blood, was kneeling there, turning into a homeless wild cat - so pitiful, yet so ridiculous. Later, he could see the collared tiger restraining himself from time to time, which made him even more amused. A tethered beast, this was his impression. The moment I saw a completely different Atsushi Nakajima, it wasn't just Dazai Osamu who aroused my anger. You are fighting for him... Ryunosuke Akutagawa ……… "Even if I delete a single thing in my life, I can't become who I am now." The year Atsushi Nakajima left the orphanage, he saw people in a parallel world That is his familiar yet unfamiliar partner in the future So, he got a black lop-eared rabbit with white hair at the end. Ps: cp mustard Black mustard and black atsushi! ! Dote on each other! The deputy CP may contain a bit too much content Intention: We sink each other