Towa no Yuugure: Asa wo Kokoro ni, Ichi, Ni to Kazoe yo

Akira spends his school days beside Towasa, his adopted sister and a brilliant artificial-intelligence researcher, while carrying feelings he has never managed to put into words. Their life still appears ordinary, but Towasa's work and ambitions are approaching a turning point that will change both of their futures. Long before Akira encounters the distant world awaiting him, the bond, promise, and tragedy that make Towasa inseparable from his life begin here.