Familiar Voice

"𝘞𝘪𝘭𝘭 𝘺𝘰𝘶 𝘭𝘰𝘷𝘦 𝘮𝘦 𝘧𝘰𝘳𝘦𝘷𝘦𝘳?"

Mikey and Y/n are a happy couple that live together in Tokyo. They plan on getting married and having a happy family of their own. What happens when Mikey starts to keep secrets from her? Did he have an affair?