Griseo's Wonderful Atelier

Little Griseo opened an art studio, hoping to encounter all kinds of colors. But it seems her customers come from different worlds. A shy rock-loving girl. An energetic horse girl aiming for an undefeated Triple Crown. A little bunny from Rhodes Island, gravely wounded and on the verge of death. A round-faced girl she met aboard the Astral Express, doing sit-ups with a strange white creature from the future. The Immortal Crane Lord who can't make conversation. The kind-looking Uncle Aizen.

...Until a Herrscher appears.

Herrscher: "Who are you?"

Griseo: "I'm the horse girls' best friend, the pilot of EVA Unit-03, a national-level alchemist, the keyboardist of the Kessoku Band, a Seven-Star Operator of Rhodes Island, a successor to a nonmaterial Archon of Teyvat, the God of Roundness's little sister, Nuwa's younger sister, and you..."

Herrscher: "Sorry to bother you. I'm leaving."

In short, this is a book with basically no heartbreaking moments.