diff --git a/tslib/storage/src/journal.ts b/tslib/storage/src/journal.ts
index 2bd9540d..79a746d1 100644
--- a/tslib/storage/src/journal.ts
+++ b/tslib/storage/src/journal.ts
@@ -32,7 +32,7 @@ interface JournalOpDeleteStudy extends JournalOpBase {
 interface JournalOpSetStudySystemAttr extends JournalOpBase {
   study_id: number
   system_attr: {
-    "study:metric_names": string[]
+    "study:metric_names"?: string[]
   }
 }
 
@@ -80,6 +80,13 @@ interface JournalOpSetTrialUserAttr extends JournalOpBase {
   user_attr: { [key: string]: any } // eslint-disable-line @typescript-eslint/no-explicit-any
 }
 
+interface JournalOpSetTrialSystemAttr extends JournalOpBase {
+  trial_id: number
+  system_attr: {
+    constraints?: number[]
+  }
+}
+
 const trialStateNumToTrialState = (state: number): Optuna.TrialState => {
   switch (state) {
     case 0:
@@ -224,7 +231,7 @@ class JournalStorage {
             }
           })
 
-    const userAtter = log.user_attrs
+    const userAttrs = log.user_attrs
       ? Object.entries(log.user_attrs).map(([key, value]) => {
           return {
             key: key,
@@ -249,7 +256,8 @@ class JournalStorage {
       })(),
       params: params,
       intermediate_values: [],
-      user_attrs: userAtter,
+      user_attrs: userAttrs,
+      constraints: [],
       datetime_start: log.datetime_start
         ? new Date(log.datetime_start)
         : undefined,
@@ -341,6 +349,16 @@ class JournalStorage {
       }
     }
   }
+
+  public applySetTrialSystemAttr(log: JournalOpSetTrialSystemAttr) {
+    const [thisStudy, thisTrial] = this.getStudyAndTrial(log.trial_id)
+    if (thisStudy === undefined || thisTrial === undefined) {
+      return
+    }
+    if (log.system_attr.constraints) {
+      thisTrial.constraints = log.system_attr.constraints
+    }
+  }
 }
 
 const loadJournalStorage = (
@@ -434,7 +452,9 @@ const loadJournalStorage = (
         )
         break
       case JournalOperation.SET_TRIAL_SYSTEM_ATTR:
-        // Unsupported
+        journalStorage.applySetTrialSystemAttr(
+          parsedLog as JournalOpSetTrialSystemAttr
+        )
         break
     }
   }
diff --git a/tslib/storage/src/sqlite.ts b/tslib/storage/src/sqlite.ts
index 3cd2cdc1..cb4be1ff 100644
--- a/tslib/storage/src/sqlite.ts
+++ b/tslib/storage/src/sqlite.ts
@@ -159,6 +159,11 @@ const getStudy = (
       }
     }
 
+    const systemAttrs = getTrialSystemAttributes(db, trial.trial_id)
+    if (systemAttrs !== undefined) {
+      trial.constraints = systemAttrs.constraints
+    }
+
     const params = getTrialParams(db, trial.trial_id)
     const param_names = new Set<string>()
     for (const param of params) {
@@ -222,6 +227,7 @@ const getTrials = (
         ),
         params: [], // Set this column later
         user_attrs: [], // Set this column later
+        constraints: [],
         datetime_start: vals[3],
         datetime_complete: vals[4],
       }
@@ -404,6 +410,20 @@ const getTrialUserAttributes = (
   return attrs
 }
 
+const getTrialSystemAttributes = (db: SQLite3DB, trialId: number) => {
+  let attrs: { constraints: number[] } | undefined
+  db.exec({
+    sql: `SELECT key, value_json FROM trial_system_attributes WHERE trial_id = ${trialId} AND key = 'constraints'`,
+    // biome-ignore lint/suspicious/noExplicitAny: <explanation>
+    callback: (vals: any[]) => {
+      attrs = {
+        constraints: JSON.parse(vals[1]),
+      }
+    },
+  })
+  return attrs
+}
+
 const getTrialIntermediateValues = (
   db: SQLite3DB,
   trialId: number,
diff --git a/tslib/storage/test/generate_assets.py b/tslib/storage/test/generate_assets.py
index c7cfaca4..2e79e141 100644
--- a/tslib/storage/test/generate_assets.py
+++ b/tslib/storage/test/generate_assets.py
@@ -96,6 +96,30 @@ def objective_multi(trial: optuna.Trial) -> tuple[float, float]:
 
     study.optimize(objective_multi, n_trials=50)
 
+    # Multi-objective study with constraints
+    def objective_constraints(trial: optuna.Trial) -> tuple[float, float]:
+        x = trial.suggest_float("x", -15, 30)
+        y = trial.suggest_float("y", -15, 30)
+        c0 = (x - 5) ** 2 + y**2 - 25
+        c1 = -((x - 8) ** 2) - (y + 3) ** 2 + 7.7
+        trial.set_user_attr("constraint", (c0, c1))
+        v0 = 4 * x**2 + 4 * y**2
+        v1 = (x - 5) ** 2 + (y - 5) ** 2
+        return v0, v1
+
+    def constraints(trial: optuna.Trial):
+        return trial.user_attrs["constraint"]
+
+    sampler = optuna.samplers.NSGAIISampler(constraints_func=constraints)
+    study = optuna.create_study(
+        study_name="multi-objective-constraints",
+        storage=storage,
+        sampler=sampler,
+        directions=["minimize", "minimize"],
+    )
+    print(f"Generating {study.study_name} for {type(storage).__name__}...")
+    study.optimize(objective_constraints, n_trials=32, timeout=600)
+
 
 if __name__ == "__main__":
     remove_assets()
diff --git a/tslib/storage/test/journal.test.mjs b/tslib/storage/test/journal.test.mjs
index 5df85e7f..1f8f1299 100644
--- a/tslib/storage/test/journal.test.mjs
+++ b/tslib/storage/test/journal.test.mjs
@@ -57,8 +57,15 @@ describe("Test Journal File Storage", async () => {
     assert.deepStrictEqual(study.metric_names, ["value1", "value2"])
   })
 
+  it("Check the study with constraints", () => {
+    const study = studies.find((s) => s.name === "multi-objective-constraints")
+    for (const trial of study.trials) {
+      assert.strictEqual(trial.constraints.length, 2)
+    }
+  })
+
   it("Check the number of studies", () => {
-    const N_STUDIES = 5
+    const N_STUDIES = 6
     assert.strictEqual(studies.length, N_STUDIES)
   })
 })
diff --git a/tslib/types/src/index.ts b/tslib/types/src/index.ts
index fab91d7d..40073924 100644
--- a/tslib/types/src/index.ts
+++ b/tslib/types/src/index.ts
@@ -74,6 +74,7 @@ export type Trial = {
   user_attrs: Attribute[]
   datetime_start?: Date
   datetime_complete?: Date
+  constraints: number[]
 }
 
 export type TrialParam = {