How to Look for Something Lost (Japanese: ナナシ～ナくしたナにかのさがシかた～, Hepburn: Nakushita Nanika no Sagashikata) is a Japanese manga series adapted from Nanashi Series online occult horror stories written by Harumi Fujino [ja] and illustrated by Shuu Katayama [ja].

It was serialized in Shōnen Gahōsha's seinen manga magazine Young King OURs from September 2018 to December 2021, with its chapters have been collected in five tankōbon volumes as of February 2022.

Adapted from Nanashi Series online occult horror stories written by Harumi Fujino [ja] and illustrated by Shuu Katayama [ja], How to Look for Something Lost started in Shōnen Gahōsha's seinen manga magazine Young King OURs on September 29, 2018.

[3][4] The manga finished serialization in the magazine on December 28, 2021.

[1] Shōnen Gahōsha collected its chapters in five tankōbon volumes, released from May 30, 2019,[5] to February 9, 2022.