The song "Happy Alone" by Barasou Mementos tells the story of someone who has been deeply hurt by a failed relationship. The lyrics talk about feeling shaken and hurt by the actions of their former partner, who walked away without looking back. The singer reflects on wasted time and regrets, and ultimately decides to find happiness in being alone. The song captures the feelings of betrayal and heartache, as well as the realization that the person they were with was not who they thought they were. The singer expresses a sense of empowerment in choosing to be alone and finding happiness in their own company, despite not being able to forget the memories of the past relationship. Overall, "Happy Alone" conveys a message of self-discovery and resilience in the face of heartbreak, and the decision to prioritize one's own well-being and happiness.