Yasu's mother passed away when he was very young and his father abandoned him. Yasu's wife, Misako, also lost both her parents when she was young. The two spend their days in happiness, watching their young son, Akira, grow up. Unfortunately, a freakish accident occurs that results in Misako sacrificing her life to protect her son. Yasu loses himself in grief and remorse, but recovers as he vows to raise his 3 year-old son as best as possible.

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