Sakura Minamoto/History

In 2008 a high school student, Sakura Minamoto leaves earlier than usual and finds her death caused by a truck.

Context
In episode 1 of the anime Sakura is shown excited because she is about to become an idol, since she had suffered from depression due to her bad luck, when she was about to go out, she forgets to look at both sides and because of her clumsiness is run over by a truck, ending her life, this happening on April 7, 2008

Way of death
Sakura: 1 (001),  乾 (sky), traffic death

The scar on her forehead was caused by a concussion in her car accident / hit by truck-san.

This is also the reason why she lost her memories and later retrieved them when she received another concussion, courtesy of truck-san again.

Personality
A person from 乾 (Heaven) must look forward and be optimistic.

Confirmed

 * Kotaro says the other girls are legendary in their own way, but specifically denies that Sakura is special. Even in life she was an ordinary high school student. However, she is the catalyst to wake up the other girls and has started to unite the group. She was chosen to be the leader for a reason.
 * Confirmed to some extent in Episode 12, in which Yugiri points out that without Sakura, the group would have been torn apart long before Arpino's concert.


 * She was killed by being hit by a truck, and her zombie form shows a large scar on her forehead.


 * The two instances so far of her flashbacks are the time she strained enough to dislocate her spine and the time she was literally thrown into the air, both similar to the events that occurred during the truck collision. She could be very upset to discover this.
 * Possibly confirmed in Episode 10: Being hit by a truck a second time, in an almost identical way, causes her to finally regain her memories.

Discarded

 * Sakura committed suicide due to the injuries she sustained after the truck hit, and after seeing Ai die on stage she decided to kill herself.
 * Discarded after episode 11

Future speculations:

 * Her official character page mentions that she speaks with a Karatsu dialect. This dialect focuses on the city of Karatsu, in the prefecture of the Northern Saga.
 * The truck that hit her had a Saga license plate showing that she lived in Saga prefecture before she died.
 * When Sakura retrieves her memories, Ai asks her if she remembers her address and she says yes. However, she does not recite her address to prove it, it is likely that the writers wanted to keep her address from us for now. But it seemed a bit forced since I (and I'm sure many others) expected her to at least say part of her address.
 * When Sakura was feeling depressed, Kotaro took her to the top of an observation deck and points to a forest in the distance indicating that it is called Nijinomatsubara Forest. Sakura's answer is "I know," which would be a little strange to know if she lived in a different prefecture.
 * Nijinomatsubara Forest is actually IN Karatsu city, so if she lived there during her life, it wouldn't be strange for her to know that.
 * The house where Kotaro and the girls live is a royal house in Karatsu city, it was a former branch of Mitsubishi Gōshi Kaisha Karatsu Branch Honkan. So when Sakura runs away from home in episode 11 (?), She naturally knows where the park is because she lived in that city when she was alive.
 * She said she had attended the Iron Frill Arpino Hall concert before she died. The Arpino room is located in the city of Karatsu, so it would make sense for her to attend if it is so close to where she lived.
 * Kotaro currently lives in the city of Karatsu with the girls. There are 10 cities in the saga prefecture, but he just passed live in the city where Sakura is most likely to have lived and died. Since they attended the same school in the past, this would make sense if she has always lived in Karatsu city and if Kotaro lived in Karatsu city, Sakura also lived in the same school.