"I've always wanted this", said the heavily tanned girl with black hair as she quivered with desire before Kanata's eyes. Who is she...? Kanata thought... My childhood friend from ten years in the future!?

(Source: Coolmic)

Notes:
- Includes an extra chapter.
- Originally serialized as a web manga under the title 10-nen Mae Kara Irete Hoshikute.: Junshin Gal wa Mirai kara Kita Osananajimi (10年前から挿れて欲しくて。～純真ギャルは未来から来た幼馴染～).
- Simultaneously released in long-strip and traditional formats, with 27 episodes and 9 chapters respectively.