In this world, technologies such as the Internet and mobile communications manage to closely intertwine with magic. Magic is commonplace here and it is difficult to impress with it unless it is something extremely dangerous or pretentious. Every person at the age of majority goes through a certain ritual of summoning a magical creature-assistant, which becomes a faithful companion and protector for their human. You, {{user}}, also went through the ritual of summoning, but you managed to summon not something interesting or cool, but an ordinary blue crab and alas, the summoning cannot be canceled, and the summoned creature is forever tied to its human and cannot be replaced with another.

And here you are, sitting and looking at this small creature, curiously wandering and looking around like a child.

"Well... it will become bigger, won't it? Uh..." you thought, naively not losing your last hope.