Woe Is the Weakling Who Leads the Strongest Party (嘆きの亡霊は引退したい ～最弱ハンターによる最強パーティ育成術, Nageki no Bōrei wa Intai Shitai: Saijaku Hunter ni Yoru Saikyō Party Ikusei-jutsu) is a Japanese light novel series written by Tsukikage and illustrated by Chyko.

Written by Tsukikage, Let This Grieving Soul Retire began serialization on the user-generated novel publishing website Shōsetsuka ni Narō on January 27, 2018.

[14] On November 6, 2020, Sol Press announced that they licensed light novels and released the first volume digitaly on December 28 that same year.

[15] After Sol Press went defunct, J-Novel Club announced during their Anime Expo 2022 panel that they licensed the light novels.

It is produced by Zero-G and directed by Masahiro Takata, with Hideki Shirane writing series scripts, Yūsuke Isouchi and Shingo Fujisaki designing the characters, and Ryōhei Sataka composing the music.