Ayumu okamura

Ichinokura Sarasa has been suffering from a constitution that makes her tired easily. She is reborn in another world, Trilgaea, by a goddess, where she is rejuvenated to the body of a 10-year-old and overcomes her frail constitution! However, she is transported to a mountain full of demons, where she cannot carelessly walk outside!?

To take revenge for her grandfather, Marie, a descendant of the demon lord, infiltrates a retirement home where former heroes and other esteemed persons gather.