Japanese literature Even if Mangetsu disappears this love / Kasui Aoyama

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Japanese literature
When I wake up in the morning, three messages appear on Haruna's mobile phone : "I have a wonderful lover!" sent to her, "I have a wonderful boyfriend!" from a boy named Mitsumori, "It's my first time. I am your lover!" and "I'm sure that person is Haruna's boyfriend!" from her best friend Karen. Haruna Kai, a second year high school student, is getting used to this life because she suffers from a disease in which only memories of love disappear on the day of the full moon. On Sunday, she is going out with Mitsumori to introduce herself as well. But I noticed that Mitsumori is not her true lover. And who her true lover is. How did Mitsumori come to play the role of "fake" lover? Why is Karen lying? What does the true "lover" think of me? What choices do they make to prevent anyone from becoming unhappy? Tears can't stop at the endless square relationship! The long-awaited new work by the award-winning author of "Kakuyoum m x Magical I Rando" contest! "I am sure that she is Haruna's boyfriend!" from her best friend Karen. Haruna Kai, a second year high school student, is suffering from a disease in which only memories of love disappear on the day of the full moon. She