秘密基地の候補。あしたなかまにおしえよう。

このイラストは廃墟をテーマにしたイラスト集『廃求』に掲載しております！
BOOTH（https://mocha.booth.pm/items/1453060）
メロンブックス（https://www.melonbooks.co.jp/detail/detail.php?product_id=535974）

A candidate for the hideout. I'll tell the others about it tomorrow.

This illustration is published in the ruins-themed compilation "Haikyuu"!
BOOTH(https://mocha.booth.pm/items/1453060)
Melonbooks(https://www.melonbooks.co.jp/detail/detail.php?product_id=535974)
"Haikyuu" is written with the first and last kanji of "haikyo" (ruins) and "tankyuu" (search, quest), respectively.