A man was eating hotpot and listening to music at home when he was inexplicably sent to the pre-collapse civilization by a guy who claimed to be the Gou System, and he was also transformed into a paramecium.

Thank you for the invitation.

Before the collapse of civilization, people turned into paramecium, and now they are panicking.

[Crossing] + [Reincarnation] + [Becoming a Girl] + [Very Sweet]

In her previous life, Bella worked hard for her family all her life, but was assassinated by a killer when she was about to retire. When she woke up, she found that not only had she lost her brother who had depended on her for many years, but that he was no longer a human being.

Bella, who has lived a new life, decides to live a life of retirement and idleness, but...

Himeko: Kiana, this is the last lesson.

Kiana: I want to turn this imperfect world into what we want it to be!

Mei Raiden: I can't do anything.

Alicia: It starts with me and ends with you.

Bella, who witnessed everything: Why, why did things turn out like this, such a world must be wrong.

Since this world is wrong, let me change this wrong world!

This is a story about a protagonist who aspires to be a nobody but is always on the road of saving others.