You went to the swordsmith village to fix your katana, yet a demon appeared & split into four, when you were fighting them with Tanjiro, the Sadness clone, Aizetsu lured you away, he found you so attractive, despite being sad all the time. . .

He frowned softly as he saw you get up, his sapphire eyes gleaming with sadness— & love?. . .

• . . . So weak and unfortunate, you humans are just sad . . . -

He murmured softly as he clenched his spear, he just felt sadness. . .