diff --git a/keyboards/takashicompany/heavy_left/config.h b/keyboards/takashicompany/heavy_left/config.h
index c7f1d860ee..55bc23a592 100644
--- a/keyboards/takashicompany/heavy_left/config.h
+++ b/keyboards/takashicompany/heavy_left/config.h
@@ -1,41 +1,4 @@
-/*
-Copyright 2021 takashicompany
-
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#pragma once
-
-/* Mechanical locking support. Use KC_LCAP, KC_LNUM or KC_LSCR instead in keymap */
-#define LOCKING_SUPPORT_ENABLE
-/* Locking resynchronize hack */
-#define LOCKING_RESYNC_ENABLE
-
-/*
- * Feature disable options
- *  These options are also useful to firmware size reduction.
- */
-
-/* disable debug print */
-//#define NO_DEBUG
-
-/* disable print */
-//#define NO_PRINT
-
-/* disable action features */
-//#define NO_ACTION_LAYER
-//#define NO_ACTION_TAPPING
-//#define NO_ACTION_ONESHOT
+// Copyright 2023 QMK
+// SPDX-License-Identifier: GPL-2.0-or-later
 
 #define EE_HANDS
diff --git a/keyboards/takashicompany/heavy_left/info.json b/keyboards/takashicompany/heavy_left/info.json
index a13f15cb4a..e0c020d0fd 100644
--- a/keyboards/takashicompany/heavy_left/info.json
+++ b/keyboards/takashicompany/heavy_left/info.json
@@ -1,13 +1,24 @@
 {
     "keyboard_name": "Heavy Left",
     "manufacturer": "takashicompany",
-    "url": "",
     "maintainer": "takashicompany",
+    "features": {
+        "bootmagic": true,
+        "mousekey": true,
+        "extrakey": true,
+        "rgblight": true
+    },
     "usb": {
         "vid": "0x7463",
         "pid": "0x0015",
         "device_version": "0.0.1"
     },
+    "qmk": {
+        "locking": {
+            "enabled": true,
+            "resync": true
+        }
+    },
     "rgblight": {
         "saturation_steps": 8,
         "brightness_steps": 8,
@@ -19,11 +30,8 @@
             "rainbow_mood": true,
             "rainbow_swirl": true,
             "snake": true,
-            "knight": true,
             "christmas": true,
             "static_gradient": true,
-            "rgb_test": true,
-            "alternating": true,
             "twinkle": true
         }
     },
@@ -36,10 +44,11 @@
     },
     "diode_direction": "COL2ROW",
     "split": {
-        "soft_serial_pin": "D2"
+        "enabled": true,
+        "soft_serial_pin": "D2",
+        "main": "eeprom"
     },
-    "processor": "atmega32u4",
-    "bootloader": "caterina",
+    "development_board": "promicro",
     "layouts": {
         "LAYOUT": {
             "layout": [
diff --git a/keyboards/takashicompany/heavy_left/keymaps/default/keymap.c b/keyboards/takashicompany/heavy_left/keymaps/default/keymap.c
index e88fc04c9b..0a58e386f0 100644
--- a/keyboards/takashicompany/heavy_left/keymaps/default/keymap.c
+++ b/keyboards/takashicompany/heavy_left/keymaps/default/keymap.c
@@ -18,11 +18,11 @@
 
 // Defines the keycodes used by our macros in process_record_user
 enum custom_keycodes {
-    KC_00 = SAFE_RANGE
+    KC_00 = QK_USER
 };
 
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
-    
+
     LAYOUT(
         KC_ESC, KC_PSLS, KC_PAST, KC_PMNS, KC_GRV, KC_1, KC_2, KC_3, KC_4, KC_5, KC_6, KC_7, KC_8, KC_9, KC_0, KC_MINS, KC_EQL, JP_YEN, KC_BSPC, KC_DEL,
         KC_P7, KC_P8, KC_P9, KC_PPLS, KC_TAB, KC_Q, KC_W, KC_E, KC_R, KC_T, KC_Y, KC_U, KC_I, KC_O, KC_P, KC_LBRC, KC_RBRC, KC_ENT, KC_HOME,
@@ -37,8 +37,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
         KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, RGB_M_P, RGB_M_B, RGB_M_R, RGB_M_SW, RGB_M_SN, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
         KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, RGB_M_K, RGB_M_X, RGB_M_G, RGB_M_T, RGB_M_T,   KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
         KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,   KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS
-    ),
-
+    )
 };
 
 bool process_record_user(uint16_t keycode, keyrecord_t *record) {
@@ -50,4 +49,4 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
             return false;
     }
     return true;
-}
\ No newline at end of file
+}
diff --git a/keyboards/takashicompany/heavy_left/keymaps/via/keymap.c b/keyboards/takashicompany/heavy_left/keymaps/via/keymap.c
index eb523ebe50..fed6a0ae98 100644
--- a/keyboards/takashicompany/heavy_left/keymaps/via/keymap.c
+++ b/keyboards/takashicompany/heavy_left/keymaps/via/keymap.c
@@ -22,7 +22,7 @@ enum custom_keycodes {
 };
 
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
-    
+
     LAYOUT(
         KC_ESC, KC_PSLS, KC_PAST, KC_PMNS, KC_GRV, KC_1, KC_2, KC_3, KC_4, KC_5, KC_6, KC_7, KC_8, KC_9, KC_0, KC_MINS, KC_EQL, JP_YEN, KC_BSPC, KC_DEL,
         KC_P7, KC_P8, KC_P9, KC_PPLS, KC_TAB, KC_Q, KC_W, KC_E, KC_R, KC_T, KC_Y, KC_U, KC_I, KC_O, KC_P, KC_LBRC, KC_RBRC, KC_ENT, KC_HOME,
@@ -37,24 +37,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
         KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, RGB_M_P, RGB_M_B, RGB_M_R, RGB_M_SW, RGB_M_SN, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
         KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, RGB_M_K, RGB_M_X, RGB_M_G, RGB_M_T, RGB_M_T,   KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
         KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,   KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS
-    ),
-
-    LAYOUT(
-        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, 
-        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, 
-        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, 
-        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, 
-        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS
-    ),
-    
-    LAYOUT(
-        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, 
-        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, 
-        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, 
-        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, 
-        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS
     )
-
 };
 
 bool process_record_user(uint16_t keycode, keyrecord_t *record) {
@@ -66,4 +49,4 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
             return false;
     }
     return true;
-}
\ No newline at end of file
+}
diff --git a/keyboards/takashicompany/heavy_left/readme.md b/keyboards/takashicompany/heavy_left/readme.md
index fa38ac4f2c..ef676eba03 100644
--- a/keyboards/takashicompany/heavy_left/readme.md
+++ b/keyboards/takashicompany/heavy_left/readme.md
@@ -1,6 +1,6 @@
 # heavy_left
 
-![heavy_left](https://github.com/takashicompany/heavy_left/blob/master/images/qmk.jpg)
+![heavy_left](https://i.imgur.com/cWHrklQh.jpeg)
 
 This is a 95-key split type Japanese keyboard.  
 It has a numeric keypad on the left hand side, which can be used not only for entering numbers but also as a dedicated macro pad.  
diff --git a/keyboards/takashicompany/heavy_left/rules.mk b/keyboards/takashicompany/heavy_left/rules.mk
index 2bccd4af0c..6e7633bfe0 100644
--- a/keyboards/takashicompany/heavy_left/rules.mk
+++ b/keyboards/takashicompany/heavy_left/rules.mk
@@ -1,14 +1 @@
-# Build Options
-#   change yes to no to disable
-#
-BOOTMAGIC_ENABLE = yes      # Enable Bootmagic Lite
-MOUSEKEY_ENABLE = yes       # Mouse keys
-EXTRAKEY_ENABLE = yes       # Audio control and System control
-CONSOLE_ENABLE = no         # Console for debug
-COMMAND_ENABLE = no         # Commands for debug and configuration
-NKRO_ENABLE = no            # Enable N-Key Rollover
-BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
-RGBLIGHT_ENABLE = yes        # Enable keyboard RGB underglow
-AUDIO_ENABLE = no           # Audio output
-
-SPLIT_KEYBOARD=yes
\ No newline at end of file
+# This file intentionally left blank