diff --git a/keyboards/takashicompany/left_slinger/config.h b/keyboards/takashicompany/left_slinger/config.h
new file mode 100644
index 00000000000..e076cbf9e2e
--- /dev/null
+++ b/keyboards/takashicompany/left_slinger/config.h
@@ -0,0 +1,5 @@
+#pragma once
+
+#define ANALOG_JOYSTICK_X_AXIS_PIN GP28
+#define ANALOG_JOYSTICK_Y_AXIS_PIN GP29
+#define ANALOG_JOYSTICK_READ_INTERVAL 1
\ No newline at end of file
diff --git a/keyboards/takashicompany/left_slinger/custom_joystick.c b/keyboards/takashicompany/left_slinger/custom_joystick.c
new file mode 100644
index 00000000000..9f6acd6826a
--- /dev/null
+++ b/keyboards/takashicompany/left_slinger/custom_joystick.c
@@ -0,0 +1,49 @@
+#include QMK_KEYBOARD_H
+#include "analog.h"
+#include "gpio.h"
+#include "wait.h"
+#include "timer.h"
+#include <stdlib.h>
+#include "print.h"
+#include "custom_joystick.h"
+
+int16_t xOrigin, yOrigin;
+uint16_t lastCursor = 0;
+int16_t joystick_ratio = 100;
+
+int16_t axisCoordinate_custom(pin_t pin, uint16_t origin) {
+    int8_t  direction;              // 符号
+    int16_t distanceFromOrigin;     // 原点からの距離。負数にはならない
+
+    int16_t position = analogReadPin(pin);  // 多分だけどデフォルトだと512が中心に来るようになっている
+
+    if (origin == position) {           // 原点と同じなら0とする
+        return 0;
+    } else if (origin > position) {     // 原点よりマイナス方向の場合の処理
+         distanceFromOrigin = origin - position;
+        direction          = -1;
+    } else {                            // 原点よりプラス方向の処理
+        distanceFromOrigin = position - origin;
+        direction          = 1;
+    }
+    
+    return distanceFromOrigin * direction;
+}
+
+void pointing_device_driver_init(void) {
+    xOrigin = analogReadPin(ANALOG_JOYSTICK_X_AXIS_PIN);
+    yOrigin = analogReadPin(ANALOG_JOYSTICK_Y_AXIS_PIN);
+}
+report_mouse_t pointing_device_driver_get_report(report_mouse_t mouse_report) {
+
+    if (timer_elapsed(lastCursor) > ANALOG_JOYSTICK_READ_INTERVAL) {    // 多分、指定のミリ秒経過したかを見て処理を走らせている
+        lastCursor = timer_read();
+        mouse_report.x = axisCoordinate_custom(ANALOG_JOYSTICK_X_AXIS_PIN, xOrigin) / joystick_ratio;
+        mouse_report.y = axisCoordinate_custom(ANALOG_JOYSTICK_Y_AXIS_PIN, yOrigin) / joystick_ratio;
+    }
+
+    return mouse_report;
+}
+
+uint16_t       pointing_device_driver_get_cpi(void) { return 0; }
+void           pointing_device_driver_set_cpi(uint16_t cpi) {}
\ No newline at end of file
diff --git a/keyboards/takashicompany/left_slinger/custom_joystick.h b/keyboards/takashicompany/left_slinger/custom_joystick.h
new file mode 100644
index 00000000000..0d7f6b94316
--- /dev/null
+++ b/keyboards/takashicompany/left_slinger/custom_joystick.h
@@ -0,0 +1,6 @@
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+
+extern int16_t joystick_ratio;
\ No newline at end of file
diff --git a/keyboards/takashicompany/left_slinger/rules.mk b/keyboards/takashicompany/left_slinger/rules.mk
new file mode 100644
index 00000000000..ea3cc965c5d
--- /dev/null
+++ b/keyboards/takashicompany/left_slinger/rules.mk
@@ -0,0 +1,4 @@
+POINTING_DEVICE_ENABLE = yes
+POINTING_DEVICE_DRIVER = custom
+ANALOG_DRIVER_REQUIRED = yes
+SRC += custom_joystick.c
\ No newline at end of file