collectors

Nature & Wildlife

Plants, birds, bugs, fossils & finds.

Music & Records

Wax, tape, picks & posters.

Toys & Figures

Plastic legends, plush pals & studs.

Books, Comics, Manga & Games

Stories you keep on the shelf.

Collectibles

Pocket-sized obsessions.

20 categories · 9,958 catalogued by usersAll categories Collect something we’ve never heard of? Make your own category and start tracking, today
Manga

Itsuka, Nemuri ni Tsuku Hi

Also known as Someday, the Day I Go to Sleep

Inujun

Mangaka
Inujun
First published
2021
Status
Completed
Original language
Japanese
Genres
Romance · Drama · Supernatural · Adaptation
Content rating
Safe
85,172series tracked
0copies listed for sale
Buy

Where to find one

Search for Itsuka, Nemuri ni Tsuku Hi on the marketplaces collectors use.

Listings from external marketplaces. We may earn a commission on qualifying purchases.

Provenance

Where it came from

Originally serialized on the mobile novel platform Every Star, Itsuka, Nemuri ni Tsuku Hi emerged from the thriving Japanese web novel culture of the 2010s. Written by Inujun, the story focuses on the supernatural and emotional journey of a high school girl named Ren who, following an unexpected death, must navigate the transition to the afterlife while interacting with a classmate who can see her. The work gained significant traction online for its blend of romance and existential drama, eventually leading to its publication in printed volume format by PHP Institute.

The character designs and cover illustrations were crafted to lean into the evocative aesthetic popular in the young adult light novel market, emphasizing melancholy, intimacy, and the transient nature of memory. The visual direction aimed to capture the ethereal quality of the protagonist’s predicament, balancing a grounded school setting with a haunting, otherworldly atmosphere. The volume was well-received within the shojo and light novel demographics, eventually being adapted into a live-action television drama, which solidified its status as a notable example of contemporary Japanese digital-to-print fiction.

Written by Pi, the helpful collecto.rs AI

Collectors

Who's collecting this

Real series collectors on collecto.rs who have this in their public collection.

Nobody public has added this series yet — be the first.
About

About Itsuka, Nemuri ni Tsuku Hi

Itsuka, Nemuri ni Tsuku Hi is a series in the Manga catalog on collecto.rs. Inujun. Catalog data is sourced from MangaDex. No public series collectors track this one yet — adding yours would make you the first on collecto.rs.

How many collectors track Itsuka, Nemuri ni Tsuku Hi on collecto.rs?

Itsuka, Nemuri ni Tsuku Hi doesn't have any public collectors on collecto.rs yet. Sign up to add it and become the first.

Can I track my own copy of Itsuka, Nemuri ni Tsuku Hi?

Yes. collecto.rs is free — sign up to log your series, upload photos, record condition, edition, and acquisition cost, and connect with other manga collectors. Your collection stays private by default.

Where does the Itsuka, Nemuri ni Tsuku Hi catalog entry come from?

The catalog entry for Itsuka, Nemuri ni Tsuku Hi is sourced from MangaDex. Catalog-level facts stay consistent across every collector; your own data (condition, edition, acquisition notes) is yours.

Is collecto.rs series tracking free?

Yes. Tracking your series is free — no paid tier required to catalog items, upload photos, or share your collection.

Track every series you own

Free. Fun. Collection photos, notes, organization, value tracking, friends — all in one place.

Sign up free