Date A Live and Kurumi is own by Koshi Tachibana

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Author p.o.v
You are y/n tokisaki a big brother of kurumi tokisaki that you were  diferrent than her as you were polite and nice towards others even from time to time you protected your little sister from dangers even you had a crush on your little sister .

You were sitting on of the long benches as you attend to your little sister wedding that makes you sad as she was married to shido

Y/n:hmm i hope she is happy...

You make low tone and look as they bride and groom are kissing each other that the wedding is finish. That you were the first one to walked away from the wedding as some of her friends look at you and your best friends tohka and origami

Tohka: y/n san where are you going?

Y/n: i am just going to go away for a while

Origami: where will you go?

Y/n: not sure just go where it flows and maybe relax my mind....

Tohka: does kurumi chan knows?

Y/n: no she does not... well i better go..

You walked away not letting your little sister sees you but it was too late she saw you

Kurumi: onii chan... where are you going?

Y/n: i am just going to be away for a while...i am not sure if i can come back or not...

Kurumi: what do you mean?

Y/n: well i am not sure yet but i have somethings to clear from my mind

Kurumi:....but onii chan... will you just stay for a while please?

Y/n: ah...anything for you my imouto

You said with a bit low tone and stay at the reception for a while and leaves as no one sees you again not even your little sister

Timeline skip
It has been a very long time since you were gone and as for kurumi she was having some problem not just normal problem some emotional problems as she started to cry in her room as her husband went to work

Kurumi:.......why...why......did you left.....  onii chan....

She started to hold his picture of you and her as kids as she cries more

Kurumi: ....you promise not to leave me..... why did you leave ....nii san why why....

After the wedding she always dream of being with the person she loved and it becomes reality that she have everything that she wanted the person that loves her and getting married to him but it wasn't right her feelings for her brother was stronger that she keeps remember the promise that she told him that she would marry her big brother. As kurumi stops crying she gets up and walked to the bathroom to wash her face as she saw her spirit form at the mirror

Kurumi: what ....

Spirit kurumi:  you abandon...nii san....our one true love!

Kurumi: i know!.... i did'nt realise....it...i was loving shido so much...that....i left nii san...alone... and now his gone because of me!...

She kneels down and started to cry

Spirit kurumi: look....i know a way to bring our nii san back...

Kurumi: how...

Spirit kurumi: this....

As her spirit form flicks her finger that kurumi suddenly changes into her spirit form and even tears up more

Kurumi: nii san.....please feel this...and come back....i miss you....

She burst through the window and started to cause mischief and chaos while you were working around a small cafe near the where your sister is as she did'nt know where you were that you always hide and wears disguise

Y/n: hmmm its kinda nice not to think about anything...though i miss kurumi..

As you keep thinking and hearing some building being destroy and people screams as you walked outside you see a figure you recognize it was kurumi with her spirit form as she attack the others who have spirit forms

Y/n: no...imouto...

You started to ran towards her and seeing your fallen allies were injured as you keep charging towards her with a bit powers from your spirit form and is in front of her

Y/n: kurumi!

She looked at you with change expression of her anger and turn to sadness and happiness

kurumi: nii san!

She started to cry while walking towards you

Y/n: what are you doing?

Kurumi: nii san..... i did this all because .....i miss you nii san....

Y/n: kurumi...

Kurumi: ....i know....what i was missing in my life....when i married to shido.....i had something in my heart was feeling alone and heartbroken....

You look down and turn around

Y/n: so.. you finally notice.... i just though you did'nt need me anymore.... so i had to leave....i just want you to be happy with shido that's all....

She stops her movement and started to cry even more

Kurumi: how can i be happy without loving my big brother!

She shouted at you while crying as she run towards you and hugged you

Kurumi: ...onii chan....you told me and promise me that you will marry me right...

You nodded slowly

Kurumi: you kept your promise.....i did'nt....i was the one who broke your promise.... onii chan can you please...forgive me...

You let arms free from you and you hugged her back

Y/n: i forgive you kurumi ... remember i will always keep my promise and always love you

You slowly kisses her on the lips as she kisses back and slowly revert back to her human form while kissing and went apart

Y/n: wait what about shido?

Kurumi: i can ask him if he we can get divorce besides me and shido wasn't actually ready to become a family but with onii chan i am ready

You smile at her and carry her back home.

Timeline skip
After the whole incident kurumi and y/n have been living together again and shido accepted kurumi request to be divorce as for the siblings well they are at the altar finish each other vows

Priest: do you y/n tokisaki take kurumi tokisaki to be your beloved wife

Y/n: i do

Priest: and do you kurumi tokisaki take y/n tokisaki to be your beloved husband

Kurumi: i do

Priest: now you may kiss the bride

You kisses her on the lips as she kisses back

Y/n: i love you imouto

Kurumi: i love you onii chan

They were happy to get married and have started to have family of their own.

Author note
Hey waddup guys its me here i hope you all enjoy this chapter more than i do so yeah i think that's it for today  and i will see you guys later peace out