Masaru Shinonome is a supporting character in the anime I Want to End This Love Game. He is the owner of a café called Cafe Kanade and is the uncle of the female protagonist, Miku Sakura. As an adult male with short black hair and black eyes, he appears as a calm and composed figure in the story.

His background is not extensively detailed, but his position as a café owner and family member places him as a stable, grounded presence in the lives of the younger characters. His personality is warm and approachable, showing a genuine interest in the romantic developments between the main characters, Yukiya Asagi and Miku. Rather than interfering directly, he offers quiet support and occasional advice.

Masaru's primary motivation appears to be a desire to see those around him happy, particularly his niece and her childhood friend. He seems to understand love and relationships from personal experience, which allows him to offer meaningful guidance to Yukiya, who often visits the café. His role in the story is that of a mentor-like figure and a safe confidant, providing a space where Yukiya can be more open and honest than he usually is around Miku.

Key relationships include his bond with Miku as her uncle, and his supportive friendship with Yukiya. He shares a warm, familial connection with Miku and treats Yukiya with kindness and understanding. Development for Masaru is minimal, as he serves more as a steady, unchanging anchor around whom the younger characters can grow. His notable abilities are not supernatural; instead, his strength lies in his emotional intelligence, patience, and ability to listen without judgment. He runs his café competently and uses that environment to foster moments of honesty and reflection for the protagonists.