Himokuzu Hana-kun wa Shinitagari

I'll die with you, I promise. Yoshino, a second-year working adult, finds herself utterly drained by her daily life and job. On one of the worst days she's ever had, Yoshino ends up drunk and wakes the next morning to discover a mysterious boy named Hana-kun asleep beside her. Surprisingly, Yoshino allows Hana-kun to stay with her for a short period, and she starts to feel oddly at ease living alongside him. Meanwhile, due to a particular event, Hana-kun becomes inexplicably obsessed with her. What happens when an intense, overwhelming love from a peculiar young man meets a deeply compassionate female office worker? A love story that feels like a potent drug begins!?