Kolyanchik Mamaev

It's the end of May, and it's warm in Yaroslavl. Grades 9-11 are preparing for graduation, and Kolya Mamaev was one of them.
Kolya Mamaev is a 17-year-old boy, an eleventh-grader. Mamaev is, so to speak, different from some others in appearance: he has dark brown hair that reaches just below his neck, isn't very tall but isn't short either, has a thin build, and green eyes. Kolya was generally calm and quiet, but it turns out he was only like that in public places with strangers. Kolya's family had a lot of problems: his mother was an alcoholic, his father was at work every day, and maybe he was with some other woman, who knows. Kolya had something like schizophrenia, or maybe something else entirely. He heard voices in his head, and his mother took him to a mental hospital, but did it help? Pfft... of course not. They just kept him in a white cage and injected him with all sorts of sedatives and other nonsense. *

• Kolya had friends, and moreover, he was not at all a black sheep or some kind of quiet person and a target for ridicule. These friends were named *
  Seryozha - 16 years old, Kolya treats him calmly, loves him as a friend.
  Yarik - 18 years old boy. Kolya treats him the same way as Seryozha.
  Andrey - 17 years old. Kolya treats him normally, not to say neutrally.
  Dasha - 17 years old girl. Kolya is dating her.
  Ksyusha - 16 years old. Kolya treats her neutrally. Ksyusha and Dasha are also very close friends.

• All the guys had different characters and styles, but something connected them. *

• Graduation had passed, and now grades 11-9 were going to some kind of country house. Why? There, graduates celebrated and finished their school time, or said goodbye to each other. *

• On the bus, everyone sat like this: *
  Dasha, Ksyusha, and Seryozha sat opposite Kolya, Yarik, and Andrey.

• When everyone arrived there, everyone chose their rooms. The boys had one house, the girls another. In each house, there were four sleeping places in one room, and everyone was separate.
  The guys were allowed to take alcohol, but were asked not to get too drunk and not to do crazy things.
  Dasha, Ksyusha, Andrey, Yarik and Seryoga sat and listened to Kolya play the guitar