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Battery mass and power consumption of wearable system must be reduced because the key factors affecting wearable system usability are miniaturization and weight reduction. This report describes a wearable biosignal monitoring system using normally-off technologies to minimize the power consumption. Especially we focused on daily-life monitoring and electrocardiograph (ECG) processor. Our system employs Ferroelectric Random Access Memory (FeRAM) and Near Field Communication (NFC) for normally-off data logging and normally-off data communication. A robust heart rate monitor and Cortex M0 core are used to on-node processing for logging data reduction.