Wonder Egg Priority (2021, Cloverworks)

Ai Ohto with heterochromia (different coloured eyes) has shut herself away, skipping school after bullying lead to the death of her only friend. One night while sneaking out, she finds a dead firefly and buries it. To her surprise she finds it talking to her and is offered a free Wonder Egg. Thinking it was just a dream, Ai wakes up...