Hitsuji no Hitsugi
Tsukuba Manji (筑波 卍)
“World War 3 is starting! Now’s the time to run and hide in my sperm!”
Five days ago at 5:55 PM.
Just when you thought your blood-related older brother Tsukuba Tsubasa, a 21 year old NEET, was coming out of his room for the first time in three years, he said “I’ll make these into tanks that can be used in World War 3 too” and started smearing his semen on the training cars of a driving school before he was reported by the local residents.
Taken into custody by the police, Tsubasa called himself the “Heaven-sent Child of the Prayer Electromagnetic Waves, Tsukuba Manji” in jail, entered the dream of his blood-related sister—you—and sent a message with sleep-disturbance electromagnetic waves.
“Sister of mine, come to see me! At this rate, the world will be invaded by cult demons!”
Ridiculing the message told to you by Tsubasa that you saw in your dreams, you went towards the jail where Tsubasa was detained—
Thank you to anonymous for the commission! R18 warning and incest. Also, HOLY SHIT, the summary does not do this work justice and I actually cried at the end LOL the twist was very good.