After reading the letter was placed on the severed wing that belonged to Tsu.
I got enraged, my student was hurt and kidnapped by the very same people who had took my Mom's life.
Kaneki: Demon Knight arts, Demonic portals.
Tsu: Sensei?!
Kaneki: I opened the portals back to greece, you guys go back I'll get Tsu.
Tsukuyumi: No way! She's my sister I nee-
Kaneki: she wouldn't have wanted you to get hurt, so please. Go home and wait.
Tsukuyumi: ...
Schwartz: but Sensei, those people-
Kaneki: ARE DEAD! So just go home already!
I was worried that my other students would get hurt if they got involved so I made them leave and go back to greece.
Everyone then started going through my portal.
Tsukuyumi: Sensei... Please save my sister no matter what.
Kaneki: I will, I promise.
After Tsukuyumi had went through the portal I ran to find Tsu using her scent that go her from her severed wing, then I closed the portal.
I ran following Tsu's scent until I reached an abandoned ware house.
Kaneki: this is where Tsu is? I have to get her back!
After I arrived I immediately activated one of my most powerful abilities Gun and turned my right arm into a Gatling gun.
Crack!
Kaneki: ARGH! Man I'm still not used to this ability that Senpai gave me. Better wear my mask.
Though I was in pain, I went inside the warehouse wearing one of my many mask.
As I entered, I began looking around for any sign of Tsu.
Kaneki: Tsu! Are you okay?! Where are you?!
I was even calling out for Tsu.
Clink!
Bang!
Since I knew I was being lured, hearing a clink made me shoot.
???: ARGHHH!
I wasn't intending to kill anyone yet, so I shot the leg of the person who tried to sneak up on me.
Kaneki: Oi where's Tsu? Where did you take my Student?!
I asked the strange person in a very cold tone.
???: She's be-
Bang!
But that person was shot, in the head.
I looked at the direction where the bullet came from and saw two girls.
???: my my don't spoil the fun.
???: Yeah, don't you know how to have fun?
After I heard their voices, I clearly remembered them. They were.
???: So the teacher of the Dog's child actually came huh?
???: why the hell would he even come? She just an animal.
They were the same girls who were expelled from Olympus high because they were planning to spread rumors about Tsu and Tsukuyumi.
Kaneki: You!
???: Welcome Sensei, you've came far.
???: you might be wondering why we are doing this? well it's because you expelled us from Sch-
They were gonna tell me a whole sob story.
Bang! Bang!
Both girls: ARGHHH!
Kaneki: I could care less, you're the ones who tried to spread rumors about my students so they would be make fun of!
???: why wouldn't we? We're the ones who are normal! Not them!
???: Olympus high is a school for high end students who were born in wealth and high status! How could we let some nobody dog girls come to the same school as us?!
Hearing them complain was seriously annoying, they were entitled brats who thinks they're better than everyone just because they were born into wealth.
Very annoying.
Kaneki: I'll spare you two if you hand over Tsu.
???: You want your Student back?
???: fine you can have her!
Press!
Bang! Clank!
They pressed a button and suddenly a bigh metal box behind me began opening.
It was very dark so I couldn't see anything in it but...
???: S-Sen... sei....
I heard a faint voice that I know very well.
Kaneki: T-Tsu?
Clank!
Tsu: Sensei....
Kaneki: Bleurgh!
I vomited as I saw Tsu who was completely mutated, she had fur on some parts of her body, she was walking on all 4's and what's worse.
Tsu: Sensei...
Her face was disfigured almost dog-like.
Kaneki: What did you do?
???: Our Seniors wanted to test out a new canine artificial ability so we decided to give it on someone perfect for testing!
???: Hahahaha! Look she really is a dog now!
???: too bad there's no way to fix her, all alterations done are permanent so she can't be turned back to her former self!
After hearing that I was frozen in place, I couldn't do anything.
My thoughts at that time were.
"What do I do? What do I do? How can I save Tsu? How can I save Tsu?"
I didn't know what to do, until... She told me.
Tsu: Sensei~ Please~ end my pain~
She was constantly in pain, and hearing her cries pierced my heart.
She wants the pain to stop, so... I did the worst thing I could possibly do.
Kaneki: I-I'm sorry.
I pointed arm Gatling gun at her head and apologized while trying to hold back my tears.
Tsu: S-Sensei.... I-I am g-glad to be y-your s-student.
Those were her final words before i...
Bang!
Shot and killed her instantly.
Thud!
I felled to my knees in despair, but I couldn't even grieve in peace.
Both girls: hahahahahaha! He killed her! She died like a dog! Hahahahaha! That's what you get for messing with us you stupid dog! Hahahahaha!
They were laughing. They were laughing and insulting Tsu and I couldn't accept it.
Kaneki: What are you laughing for?
Both girls: huh?
Kaneki: WHY THE HELL ARE YOU LAUGHING?!
At that time I was completely consumed by my rage and I...
Bang! Bang! Bang! Bang!
Splatter!
I shot with thousands of bone bullets killing them both and turning them into a mist of blood.
Kaneki: I'm sorry! I'm sorry Tsu!
I constantly apologized to Tsu's corpse but I knew I can't just leave her in the warehouse.
So I carried her back to Greece through my portals and...
Needless to say everyone were saddened with the news Tsu's death, Tsukuyumi and Arie were the most devastated from her death.
Kaneki: I'm the one who killed her... I'm sorry.
I apologized and told Arie Sensei and Tsukuyumi everything, and they didn't say anything to me after that.
After Tsu's funeral I left Greece and never came back as Tsukuyumi or the others teacher again.
Flashback end*
Kaneki's thoughts*
(Tsukuyumi definitely hates me for killing Tsu)
Kaneki: I'm sorry I'm sorry.
After remembering these painful memories, Kaneki began crying and apologizing to Tsukuyumi.
Tsukuyumi: Why are you apologizing Sensei? You didn't do anything wrong.
But Tsukuyumi doesn't want him to apologize.