A/N: First thing first, in this story I made the location of the main places in the Your Lie in April anime (such as the Towa Hall) as in the capital, Tokyo. (which is the case in real life).

Second. in my opinion, after Kaori dies the "remaining adults" in Kousei's live especially his father must do everything they can to restore Kousei's happiness and shower him with love he deserves. That's why in this story I give Kousei a stepmother, a loving one, and three siblings.

Tokyo, April 25th, 2018

April soon to end. Kousei sighed as he wakes up from his bed. 

April will never be unforgettable for him, as four years ago in that month, he was told that his best friend loved a girl he was in love with. Those chain of events, which yanked him out of his childhood trauma, also resulted in grief, as he once again lost a loved one; Miyazono Kaori.

With the help of his best friends, his remaining family; especially his father, Takahiko and his stepmother, Arima (formerly Tanibe) Yumi, a widowed high school music teacher that Takahiko married four months after Kaori's death; and later, his rivals, Takeshi and Emi, he rise up and rekindled his dream to be a professional pianist. Due to him being the Champion of the East Japan Piano Competition, which was held in the same day as Kaori's passing day, he was accepted into Okutsu Musical High School, an affiliate of Okutsu University College of Music.

Speaking of his stepmother, Takahiko's marriage to Yumi also resulted in Kousei having three half-siblings, something considered as rare in Japan; two half-sisters, Nana (15) and Risa (12), and one half-brother, Daigo (22), worked as a medical technician. All of them loved Kousei like he is their own blood sibling, further helped him to get over Kaori's death.

In Okutsu, he soon found himself in love with Igawa Emi, his female piano rival. On Christmas Eve in his first year, he confessed to Emi and they become couple. They often performed together in a two-piano duets across the country and soon. Kousei and Emi are dubbed by the pianist community as  "Duumvirate" and as the latter, winning many competitions. Meanwhile, Tsubaki and Watari, his best friend, attend different school than Kousei. Both are under sport scholarship and have aspiration to play professionally.

Times went by, and Kousei graduated as overall valedictorian. Emi and Takeshi was the second and third overall rank respectively. 

Soon, he saw his father and his half-brother prepared themselves for their work as the house's TV was tuned on the current news, which was focused on another increase of tension in the Korean Peninsula. Especially after in 2017, North Korea launched test missiles over Hokkaido. Kousei himself has been accepted by Okutsu University, College of Music and he is eager to start his college life, with Emi in his side. 

April 25th, 20.40, when his father just arrived from his work, the city's air raid siren blared over the surrounding area. 

https://youtu.be/2SN5J5Rcakc

"Kousei, check for J-Alert emergency message!" His stepmother, Yumi, ordered him as Takahiko immediately preparing the underground shelter in their house. Kousei opened his phone and his blood run cold: the J-Alert broadcast had informed a North Korean ballistic missile launch, this time, as a real attack, not a mere test launch. The message also informed that North Korea had declared war towards the South and launching massive assault to break through the DMZ.

"Mum, Dad, this is a real attack, We are under attack!" Kousei said. "Alright, everyone, go into the shelter, NOW!". Takahiko, Yumi, Kousei, Nana, and Risa immediately head into the underground shelter and closed it. 

Inside the basement, Kousei try to call Emi, Tsubaki, Takeshi, and Watari, but the answer are all the same.

"the number that you are trying to call is not reachable"

.

.

.

.

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"Minna, Okiwo tsukete" (Everyone, please stay safe) Kousei prayed, inside the dim air-raid shelter. 

A/N: What's your opinion about this opening shot of the war in East Asia, when North Korea launched a ballistic missile in a real attack towards Japan? By the way, this particular attack is not WMD. Which mean the missile is not carrying nuclear, biological, or chemical warheads.