Master
Tatsunoko had already prepared the ritual in the center of a local park. He had already taken down everyone in the park.
He modified the usual ritual a bit, using the blood of a few locals he had just taken down, hoping it would bring him better results.
He was hoping to obtain an Assassin or Archer class of servant, but as long as he didn't get the annoying Berserker or Rider class, he felt like he would be fine.
Tatsunoko was still looking through the thermal scope of his sniper rifle, unable to detect anyone in the area.
"Well then... All or nothing..." He said to himself, as he extended one of his arms towards the summoning circle as he closed his eyes.
"Sentō de shibō shite iru eiyū no rei ga,
 watashi wa anata no koto o onegai shi,
 futatabi ikiru tame ni modotte modotte kudasai.
 Watashi ni anata no saikyō no seishin, watashi no junsuina tamashī,
 no soba de tatakau koto ga dekiru mono o mamoru koto ga dekiru mono o okutte kudasai.
 Watashi wa, karera o shōkan!" 
The last few words he shouted, as the circle started releasing smoke all over the place.
Tatsunoko stared at the center of the circle, ready to see who would serve him in this battle.

Servant
A few seconds after Viona was done with her summoning ritual, the summoning circle turned into ice. A few more seconds later, a few shards of ice started erupting out of the ground around the circle, not hitting Viona. Even more seconds later, a girl appeared in the center of the circle. The girl was just sitting there with crossed legs with a depressed look in her eyes.
The girl looked to be very young, around the age of 16, and didn't exactly seem as any kind of threat.
The girl had a lollipop in her mouth, and had purple shoulder-length straight hair and, what looked to be, blue eyes, but they had some purple in them too. She wasn't exactly on the long side, being only 1 meter and 60 centimeters. 
Her clothing style was quite unique, she wore a white sweatshirt with long dark blue sleeves, wearing a black singlet under it. She also wore some kind of yellow pendant. Beneath that, she wore a light brown pleated checkered skirt, with long dark & light purple striped stockings and a pair of white shoes.
The girl didn't exactly look to harmful, if anything you would say she is your average schoolgirl. 
The girl turned towards the one who just summoned her, with a sad and depressed look on her face.
"So... You are my master... Right?" She whispered just loud enough for her master to hear with an innocent and pure voice.
The girl started to stare in the distance after completing her sentence. 
It was as if she just saw something horrible, and had a hard time processing it.