The planet has a comfortable average temperature but depending on location and season, can be very cold or hot. It atmosphere is 3.5% Carbon dioxide, which may medical issues especially after a week of exposure, so a filter mask is recommended. Effects of breathing the planet's atmosphere on humans include flushed skin, rapid respiration, higher pulse and blood pressure, and mild narcosis (passing out). The body can adjust some over time, becoming less sensitive to the CO2.
Miu was originally colonized in YE 28 under the control of the Fifth Expeditionary Fleet and protection until YE 29 when the Mishhuvurthyar conquered the Bard Cluster. It was then under the control of the Mishhuvurthyar until their defeat in YE 30.
After the Mishhuvurthyar were driven off the system was once again under the control of the Yamatai Star Empire . The system was under the control of the Fourth Standard Fleet, and it was re-colonized primarily by former Yamatai Star Empire soldiers. It was named after the Taisho Shimizu Akina ( 清水明菜 )'s daughter Shimizu Miu (清水艶美).
In YE 32 the colony was abandoned when the NMX forced the Fourth Standard Fleet to have to consolidate its holdings after losing a major portion of their fleet in two engagements. Prior to abandoning it the Fourth Standard Fleet damaged all structures and equipment so they could not be used by the enemy.
In YE 36, Miu was restored to the list of planets claimed by Yamatai because of its position on the path to Jiyuu and the Outer Colonies, following the signing of the Defense Arrangement Treaty (of the) Alliance of Signatory States.