Pilgrim

That night, a scared Inago asks to sleep in Akemi's bed. She agrees, but wakes up to find Inago gone. She finds a door into a strange castle filled with surreal monstrosities, and is told that she is in the Other World. Alice has kidnapped Inago and challenges Akemi to find her way through the seven Storeys of the castle and save her. With the help of the mysterious, blue-skinned undead Suu, Akemi must get to the top and save Inago.

Résumé

Pilgrim is an Wolf RPG Editor horror game by Kona Kona Kona Kona Kona (or Kona 5), and is part of The 'Verse with Itadori No Ko, Sukutte, and Akemi-Tan. It stars Akemi, a schoolgirl who dotes on her little sister Inago. At the school she goes to, an incident a month ago happened where three girls jumped off the top of the building and died- although it was classified as suicide, the girls showed no signs of being suicidal. While pondering this and walking with Inago one day, she comes across a little blonde girl calling herself Alice who tells Inago she will "fetch" her.