Jin Sagami/History

Early Years
Early childhood, elementary school, middle school, upbringing, etc.

War Era
Information about what the character was doing, if anything, during the previous year as it pertains to the war. (In the case of first years, their middle school information would go under "early years," but instances such as Tomoya watching Wataru perform when visiting Yumenosaki would go here since it more specifically pertains to the war.)

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

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).