Tantei wa Mou, Shindeiru. The Lost Memory

Kimihiko Kimizuka, a young man who four years ago found himself drawn into the extraordinary world of a brilliant detective known as "Siesta" after a chance encounter on a hijacked airplane. Together, Kimihiko and Siesta embarked on thrilling adventures across the globe, unraveling mysteries and facing dangers that ordinary people could never imagine. Now, Kimihiko attempts to leave his unusual past behind and embrace a quiet life as a high school student, but the echoes of his time with the detective continue to shape his present in unexpected ways. (Source: Crunchyroll, edited)