Digimon Adventure 02 Drama CD: The Door into Summer

Natsu e no Tobira is a 2003 CD drama. It is the second in the Digimon Adventure 02 continuity.

Overview
Taking place in the summer of 2003, Davis and DemiVeemon meet up with Mimi, Willis, and Gummymon in New York City. However, without warning, the entire city falls under a strange winter and becomes deserted. The kids hear a voice and see fireflies before meeting a nameless girl, whom Davis names "Nat-chan" from the Japanese word for "summer". Nat-chan displays feelings for Davis, but the group does not know that she is really a giant clawed Digimon, who makes her transformation by using the "fireflies", which are revealed to be data chips, which have corrupted her data. Davis realises Nat-chan was lonely and just wanted a Digidestined partner. Unfortunately, Nat-chan dies and comes back as a Digitama, but luckily, Davis and the others take it upon themselves to help find Nat-chan's true Partner.

Willis and Mimi indicate that the sudden winter was created from Davis' heart, which was unhappy after losing the district soccer competition and his unrequited love for Kari.

The name of this audio drama means "The Door to Summer", meaning the portal back to their own world, and recalled by Mimi from what appears to be the book The Door into Summer during the drama.