Uroboros

Uroboros (ウロボロス) was a swarm of cockroaches that Lyutillis Haltina befriended.

Lyutillis Haltina
Lyutillis considered Uroboros to be her first real friend.

Trivia

 * is a symbol depicting a serpent eating its own tail. It is often interpreted as a symbol for eternal cyclic renewal or a cycle of life, death and rebirth; the snake's skin-sloughing symbolises the transmigration of souls.