Shun’s imouto Shirone drowned on a hot midsummer day. He could not forget the memory of that day and was held back by the events of the past. Finally, he decided to continue living his life for her sake as well, accepting the past and moving on while still cherishing their precious memories. After suffering through his childhood, now every day is an unchanging day at school.
Summer has arrived this year and once again, he thinks back to his time with Shirone. Then he heard the sounds of her favourite song being played on the piano from afar. When he followed the sounds to its source, he saw his imouto there.
“Please take care of me from now on, onii-chan.”
Shirone was no longer in this world. Standing before him was Trino, an android who looked exactly like Shirone. She was a new kind of android that his genius childhood friend Sara had created to bring him happiness. Just like others which have gradually assimilated into society, Trino looks, moves, sounds and feels like a human. However, she had one unique trait: she carried Shirone’s memories.
Soundtrack and bonus not included