Series by 種村有菜

Ai treats Friday as her special day because it lets her see the older boy she likes in the library. It is also the day she tutors her young cousin Nekota. When she tries to confess to her crush, Nekota interrupts and then suddenly confesses to her himself. Ai is left caught between the boy she has long admired and an unexpectedly serious younger admirer. Her quiet routine turns into a love triangle that starts with one chaotic Friday.

Mitsuki Koyama, a 12-year-old orphan with dreams of becoming a singer, is determined to fulfill a promise to her childhood love, Eichi, despite battling a life-threatening throat condition. Her grandmother, who despises music, forbids her from pursuing her passion, leaving Mitsuki feeling trapped. Everything changes when two shinigami, Takuto and Meroko, appear, revealing she has only one year left to live. Moved by her determination, Takuto uses his powers to transform Mitsuki into a healthy 16-year-old, allowing her to chase her dream as the singer "Full Moon." As she navigates the challenges of fame, hidden truths, and her own fate, Mitsuki discovers the power of love, courage, and the music that connects hearts.

Maron Kusakabe appears to be an ordinary high school student and rhythmic gymnastics club member. In secret, she transforms into a phantom thief sent by God. With the help of the semi-angel Finn, she seals demons hiding inside beautiful objects. Her theft notices and nighttime missions make her a target for police attention. The setup combines school life, action, and a magical fight against corrupting demons.