Upon receiving an invitation to a treasure hunt from the famous mysterious item artist Reinette, Ramune and Kuro visit Reinette's mansion. There they encounter Ayame and Nico, who have also come to participate in the treasure hunt. However, when Ramune sees the man with them, his expression freezes, and he attempts to flee the scene. That man is Ramune's master Momiji!
By having us complete 
missions in various rooms,
،بجعلنا ننجز المهامّ في غرف مختلفة
Dadurch, dass wir in jedem Raum
Missionen erfüllt haben,
Al completar misiones en varias salas,
En accomplissant des missions
dans chaque pièce,
Facendoci completare le missioni 
nelle singole stanze,
Ao nos obrigar a fazer
missões em várias salas,
Заставив выполнять задания
в разных комнатах,