Hiiro Amagi/History

Early Years
Hiiro was born in a traditional village alongside Rinne. Their father was the chief of the village, with Rinne next in line as his heir. Hiiro was accordingly raised to be Rinne's shield. It is not mentioned exactly when or how, but their mother dies at some point during Hiiro's early years.

Rinne leaves the village when Hiiro is still quite young. It's unclear how old exactly Hiiro is at the time of Rinne's departure, but based off of Rinne being 17 when he met Niki in Hot Limit, Hiiro was 13 or younger.

A few years later, Hiiro is sent out to the city to retrieve Rinne due to their father's declining health.

Last Year (Enstars! Era)
It's unclear when Hiiro was sent out, but it is confirmed that Hiiro was present in the city at the end of this era as he attends Trickstar's performance at the last SS.

Current Year (Enstars!! Era)
"See: Appears In" Information about what the character did during the Enstars!! year.

Next Year
Information about what the character is doing next year, if notable (ie, becomes the leader of their unit, goes on to start a company, continues being an idol with classmate A, etc).