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Inclusion Criteria:

* Patients who were diagnosed pathologically with DLBCL, NOS, DLBCL transformed from indolent B-cell lymphoma, or high-grade B-cell lymphoma with DLBCL morphology and with MYC and BCL2 and/or BCL6 rearrangements, based on the 2017 WHO classification.
* Patients with relapsed or refractory disease despite 2 or more prior systemic therapies.
* Japanese patients aged ≥ 18 years at the time of informed consent. For Japanese subjects, it should be confirmed that the parents who are related by blood to the subject must be Japanese.
* Patients who have a lesion that can be assessed for staging and evaluated for response according to the Lugano criteria (2014). A lesion that has received radiotherapy as the most recent treatment will be considered as a measurable lesion only when progression has been documented following completion of the radiotherapy.
* Patients with an Eastern Cooperative Oncology Group (ECOG) performance status of 0, 1, or 2 at screening.

Exclusion Criteria:

* Patients with a pathological diagnosis of Burkitt's lymphoma.
* Patients with bulky disease with the longest dimension of ≥ 10 cm.
* Patients with a history or complication of post-transplant lymphoproliferative disorders.
* Patients with lymphoma with active central nervous system involvement at the time of screening, including leptomeningeal disease.
* Patients complicated with other active malignancies or patients with a history of other malignancies within 3 years before informed consent. However, the following are exceptional:

  * Non-melanoma skin cancer
  * Non-metastatic prostate cancer
  * Cervical carcinoma in situ
  * Ductal carcinoma in situ or lobular carcinoma in situ
* Patients with clinically significant third space fluid accumulation (e.g., ascites requiring drainage or pleural effusion requiring drainage or associated with shortness of breath).
* Patients who underwent autologous hematopoietic stem cell transplantation (AHSCT) within 30 days prior to the start of study drug administration (Cycle 1 Day 1).
* For the Phase I part, patients with prior allogeneic stem cell transplantation (Allo-HSCT) before the start of study drug administration (Cycle 1 Day 1). For the Phase II part, patients undergoing Allo-HSCT within 60 days prior to the start of study drug administration (Cycle 1 Day 1).
* Patients who had a positive HIV antigen-antibody test or HIV antibody test.
* Patients positive for HBs antigen, HBc antibody, or HBs antibody. However, patients who meet any of the following are eligible:

  * The patient's HBs antibody positivity is clearly due to vaccination.
  * Patients who are positive for HBs antibody and/or HBc antibody with HBV-DNA not detected and agree to undergo HBV-DNA tests once a month from the start of study drug administration to at least 12 months after the completion of study drug administration.
* Patients positive for HCV antibody. However, patients with negative HCV-RNA are eligible.
* Patients who received anticancer therapy during the following periods prior to the start of study drug administration (Cycle 1 Day 1).

  * Cytotoxic chemotherapy: within 14 days.
  * Antibody therapy: within 5 half-lives or 14 days, whichever is longer (including monoclonal antibody preparations, radioimmunoconjugates, or antibody-drug conjugates). Within 14 days for rituximab, anti-CD3/CD20 bispecific antibody.
  * Radiotherapy: within 14 days
  * CAR-T therapy: within 100 days
  * Other anticancer therapy: within 14 days
* Patients who received treatment with any other investigational product within 14 days prior to the start of study drug administration (Cycle 1 Day 1). However, for the Phase I part, patients who received any other investigational product within 14 days or 5 half-lives, whichever is longer, before the start of study drug administration (Cycle 1 Day 1).

• Nagoya, Aichi-ken, Japan
• Nagoya, Aichi-ken, Japan
• Kashiwa-shi, Chiba, Japan
• Fukuoka, Fukuoka, Japan
• Iizuka-shi, Fukuoka, Japan
• Fukushima, Fukushima, Japan
• Gifu, Gifu, Japan
• Ota-shi, Gunma, Japan
• Sapporo, Hokkaido, Japan
• Himeji-shi, Hyōgo, Japan
• Yokohama, Kanagawa, Japan
• Kyoto, Kyoto, Japan
• Sendai, Miyagi, Japan
• Matsumoto-shi, Nagano, Japan
• Nagasaki, Nagasaki, Japan
• Osaka, Osaka, Japan
• Osaka, Osaka, Japan
• Izumo-shi, Shimane, Japan
• Bunkyo-ku, Tokyo, Japan
• Chuo-ku, Tokyo, Japan
• Koto-ku, Tokyo, Japan
• Tachikawa-shi, Tokyo, Japan
• Yamagata, Yamagata, Japan