「俺、実はロリコンなんだ」折紙に嫌われるためのデートで、士道が一世一代の大カミングアウト！？一方携帯電話を手に入れた十香は、士道からの「別れよう」という言葉に大ショックを受けて……。士道をはさんだ三角関係の行方は果たして――！？

七月七日。七夕祭りの賑わいの中、士道は最悪の精霊、狂三と出会う。 そして二人が向かった先は--結婚式場!?

A huge sphere suddenly began to emit a mysterious spiritual wave in Tengu City and disrupts its peace. A mysterious, beautiful girl showed up at the same time. Secretly, what is her purpose to cast her line of sight to Shido and the others?

This is the story of Tokisaki Kurumi that shouldn't have been told. The amnesiac young girl, Empty, who woke up in the neighboring world encounters Tokisaki Kurumi. Led by her, the place she arrived at was the school's classroom. In order to kill each other, the girls known as semi-Spirits gathered. Now then——Let's begin our battle (date).

Second part of the Date a Bullet spin-off.