Koufuku no Shokutaku ~Shiawase no Hane~

One day, when Hiroki was about to get on a bus, a girl asked directions to him. Due to this, he missed the bus. But he was surprised to hear later that the bus he had missed had a serious traffic accident.... Shortly afterward, his father gets re-married, and a new younger sister, Otoha, starts to live with him, whom he met at the bus stop the other day. One day, he wakes up late, and leaves his house without eating breakfast that Otoha cooked. Since that day, various ominous things happen around him....