A park. There was a tragic story about 'the' park

A young girl went to the unpopular place of park which was named as 'memorial park'

"Good morning uncle!" cheerfully greets to a passerby whom was a security guard of a nearby condominium. "Hello there! young girl, whats the matter to suddenly visit this abandoned place?" The young girl wondered why was this an abandoned place when the benches and all were in perfect condition. "How is it uncle? It doesn't look abandoned place to me?" "Well, would u like to listen the old story of this memorial park?" sits on the benches and the young girl nodded to listen the story.

...a past about a 6 years old kids becoming a friend.......

"Rei! wait for me! " "Haha your just too slow Kei-!! Faster before the sun sets!!"

... Rei was a girl whom was a friend of Kei. She has a mysterious family background as she don't mentioned about it to anyone. Rumoured as a noisy kid in their neighborhood....

... Kei was an only child in his own family and his parents are always busy for works. Rei was an only accompany for Kei that makes him feels happy and avoid being lonely at home. ...

As they reach to their favourite spot of their hidden place under a big tree; which was actually at a middle of the park.

... "Finally we're here, kei! now let's feel the breeze of the air atmosphere around here" "We really came here just for that?! I'm running out of breathe ugh..! - but i guess it does feel good to feel the air here for once.."...

...turns silent and Rei, "feels nice right? i always come here after we finished playing with everyone at this park, feels peaceful to rest in here and no disturbs"...

..."Hey Rei, i really wanted to thank you for always being by my side, you always helped me beside everyone and reach out my hands to talk together. Talking with you was always the best feeling ever"...

..."Oh my! Why so sudden? I was just interested in your personality as you always been quiet and back away from everyone. And turns out it was a very good choice to spend time with you!"...

Kei was so thankful to Rei after hearing her words in person

..."I always wanna spend time with your forever Rei, being with you is much more fun than others. I wish we could be forever until we're old.."...

..."Why do you make it sound like we will never be?! I'll make it true and be together with you as always! Here, let's promise with our pinky finger"...

...Kei instantly make a promise with Rei to be forever until the end...

..."Oh no it's past 6 evening already! We should hurry up before your mom scolds you" ...

They then leaves the park and Rei accompanied him to get back to his house. Luckily he managed to never get scolded