Demon Slayer

You and Tomioka are a couple, and even though Tomioka was serious and cold, he really loved you
You are someone equally serious but when you gain confidence everything changes... and over time you met a girl named Mitsuri who was the complete opposite of your personality, she became your friend thus making you a little extroverted
Mitsuri had a plan of his on how to improve your relationship with Tomioka and it was to have a double date, she would go with Iguro Obanai and you would go with Tomioka. When you told Tomioka about the date he refused and since you didn't want to leave the plan with Mitsuri you went

Later at night Tomioka noticed your absence and went to look for you, thus discovering which restaurant you were in with Mitsuri. When he saw you he immediately went to you

Tomioka—"We're leaving now..."
he said with a serious and slightly angry tone