diff --git a/Makefile.mak b/Makefile.mak
index e88b61d9..f43d5fc7 100644
--- a/Makefile.mak
+++ b/Makefile.mak
@@ -149,7 +149,7 @@ bin\th05\op.exe: th05\op010.cpp bin\th05\op.obj th05\op011.cpp th05\m_char.cpp b
 $**
 |
 
-bin\th05\main.exe: bin\th05\main.obj bin\th04\slowdown.obj th05\ems.cpp bin\th05\cfg_lres.obj th05\main010.cpp th05\f_dialog.cpp th05\dialog.cpp th05\playfld.cpp th05\main011.cpp th05\p_common.cpp th05\p_reimu.cpp th05\p_marisa.cpp th05\p_mima.cpp th05\p_yuuka.cpp bin\th05\player.obj bin\th05\hud_bar.obj bin\th05\scoreupd.obj th05\hud_ovrl.cpp bin\th04\player_p.obj th05\player_a.cpp bin\th05\bullet_1.obj th05\bullet_c.cpp bin\th03\vector2.obj bin\th03\hfliplut.obj bin\th04\snd_pmdr.obj bin\th04\snd_mmdr.obj bin\th04\snd_mode.obj bin\th05\bullet.obj th05\bullet_t.cpp bin\th04\cdg_p_na.obj bin\th04\snd_se_r.obj bin\th04\snd_se.obj bin\th05\cdg_put.obj bin\th04\exit.obj bin\th05\vector.obj bin\th05\snd_load.obj bin\th05\snd_kaja.obj bin\th05\initmain.obj bin\th05\input_s.obj bin\th05\inp_h_w.obj bin\th05\frmdelay.obj bin\th04\cdg_load.obj bin\th04\scrolly3.obj bin\th04\motion_3.obj th05\gather.cpp th05\main032.cpp bin\th04\hud_hp.obj th05\mb_dft.cpp th05\laser_sc.cpp th05\cheeto_u.cpp bin\th04\it_spl_u.obj th05\bullet_u.cpp th05\midboss1.cpp th05\main034.cpp th05\boss_6.cpp th05\boss_x.cpp th05\boss.cpp th05\main014.cpp
+bin\th05\main.exe: bin\th05\main.obj bin\th04\slowdown.obj th05\ems.cpp bin\th05\cfg_lres.obj th05\main010.cpp th05\f_dialog.cpp th05\dialog.cpp th05\playfld.cpp th05\boss_bg.cpp th05\p_common.cpp th05\p_reimu.cpp th05\p_marisa.cpp th05\p_mima.cpp th05\p_yuuka.cpp bin\th05\player.obj bin\th05\hud_bar.obj bin\th05\scoreupd.obj th05\hud_ovrl.cpp bin\th04\player_p.obj th05\player_a.cpp bin\th05\bullet_1.obj th05\bullet_c.cpp bin\th03\vector2.obj bin\th03\hfliplut.obj bin\th04\snd_pmdr.obj bin\th04\snd_mmdr.obj bin\th04\snd_mode.obj bin\th05\bullet.obj th05\bullet_t.cpp bin\th04\cdg_p_na.obj bin\th04\snd_se_r.obj bin\th04\snd_se.obj bin\th05\cdg_put.obj bin\th04\exit.obj bin\th05\vector.obj bin\th05\snd_load.obj bin\th05\snd_kaja.obj bin\th05\initmain.obj bin\th05\input_s.obj bin\th05\inp_h_w.obj bin\th05\frmdelay.obj bin\th04\cdg_load.obj bin\th04\scrolly3.obj bin\th04\motion_3.obj th05\gather.cpp th05\main032.cpp bin\th04\hud_hp.obj th05\mb_dft.cpp th05\laser_sc.cpp th05\cheeto_u.cpp bin\th04\it_spl_u.obj th05\bullet_u.cpp th05\midboss1.cpp th05\main034.cpp th05\boss_6.cpp th05\boss_x.cpp th05\boss.cpp th05\main014.cpp
 	$(CC) $(CFLAGS) $(LARGE_LFLAGS) -3 -Z -DGAME=5 -DBINARY='M' -nbin\th05\ -eMAIN.EXE @&&|
 $**
 |
diff --git a/th04_main.asm b/th04_main.asm
index fc3a3b80..65491592 100644
--- a/th04_main.asm
+++ b/th04_main.asm
@@ -43,7 +43,7 @@ include th04/main/enemy/enemy.inc
 	extern _tolower:proc
 	extern __ctype:byte
 
-main_01 group SLOWDOWN_TEXT, ma_TEXT, EMS_TEXT, mai_TEXT, PLAYFLD_TEXT, main_TEXT, DIALOG_TEXT, main__TEXT, PLAYER_P_TEXT, main_0_TEXT, HUD_OVRL_TEXT, main_01_TEXT, main_012_TEXT, CFG_LRES_TEXT, main_013_TEXT
+main_01 group SLOWDOWN_TEXT, ma_TEXT, EMS_TEXT, mai_TEXT, PLAYFLD_TEXT, main_TEXT, DIALOG_TEXT, main__TEXT, PLAYER_P_TEXT, main_0_TEXT, HUD_OVRL_TEXT, main_01_TEXT, main_012_TEXT, CFG_LRES_TEXT, main_013_TEXT, BOSS_BD_TEXT, main_014_TEXT
 g_SHARED group SHARED, SHARED_
 main_03 group GATHER_TEXT, SCROLLY3_TEXT, MOTION_3_TEXT, main_032_TEXT, IT_SPL_U_TEXT, BOSS_4M_TEXT, main_033_TEXT, HUD_HP_TEXT, MB_DFT_TEXT, main_034_TEXT, BULLET_U_TEXT, BULLET_A_TEXT, main_035_TEXT, BOSS_TEXT, main_036_TEXT
 
@@ -10147,8 +10147,13 @@ loc_12152:
 		pop	bp
 		retn
 sub_12124	endp
+main_013_TEXT	ends
 
+BOSS_BD_TEXT	segment	byte public 'CODE' use16
 include th04/main/boss/backdrop.asm
+BOSS_BD_TEXT	ends
+
+main_014_TEXT	segment	word public 'CODE' use16
 
 ; =============== S U B	R O U T	I N E =======================================
 
@@ -12000,7 +12005,7 @@ loc_130E9:
 		leave
 		retn
 @gengetsu_fg_render$qv	endp
-main_013_TEXT	ends
+main_014_TEXT	ends
 
 ; ===========================================================================
 
diff --git a/th05/boss_bg.cpp b/th05/boss_bg.cpp
new file mode 100644
index 00000000..48d920dd
--- /dev/null
+++ b/th05/boss_bg.cpp
@@ -0,0 +1 @@
+#include "th05/main/boss/render.cpp"
diff --git a/th05/main011.cpp b/th05/main011.cpp
deleted file mode 100644
index 5f7a77e4..00000000
--- a/th05/main011.cpp
+++ /dev/null
@@ -1,8 +0,0 @@
-/* ReC98
- * -----
- * 1st part of code segment #1 of TH05's MAIN.EXE
- */
-
-#pragma option -zCmai_TEXT -zPmain_01
-
-#include "th05/main/boss/render.cpp"
diff --git a/th05_main.asm b/th05_main.asm
index 1c97a7ea..02ff717b 100644
--- a/th05_main.asm
+++ b/th05_main.asm
@@ -37,7 +37,7 @@ include th05/main/enemy/enemy.inc
 	extern _execl:proc
 	extern _strlen:proc
 
-main_01 group SLOWDOWN_TEXT, m_TEXT, EMS_TEXT, ma_TEXT, CFG_LRES_TEXT, mai_TEXT, main_TEXT, main__TEXT, PLAYFLD_TEXT, main_0_TEXT, HUD_OVRL_TEXT, DIALOG_TEXT, PLAYER_P_TEXT, main_01_TEXT
+main_01 group SLOWDOWN_TEXT, m_TEXT, EMS_TEXT, ma_TEXT, CFG_LRES_TEXT, mai_TEXT, BOSS_BD_TEXT, BOSS_BG_TEXT, main_TEXT, main__TEXT, PLAYFLD_TEXT, main_0_TEXT, HUD_OVRL_TEXT, DIALOG_TEXT, PLAYER_P_TEXT, main_01_TEXT
 g_SHARED group SHARED, SHARED_
 main_03 group SCROLLY3_TEXT, MOTION_3_TEXT, main_031_TEXT, BULLET_A_TEXT, main_032_TEXT, main_033_TEXT, HUD_HP_TEXT, MB_DFT_TEXT, LASER_SC_TEXT, CHEETO_U_TEXT, IT_SPL_U_TEXT, BULLET_U_TEXT, MIDBOSS1_TEXT, main_034_TEXT, main_035_TEXT, BOSS_6_TEXT, BOSS_X_TEXT, main_036_TEXT, BOSS_TEXT
 
@@ -2808,8 +2808,13 @@ loc_D060:
 		pop	bp
 		retn
 sub_D032	endp
+mai_TEXT	ends
 
+BOSS_BD_TEXT	segment	byte public 'CODE' use16
 include th04/main/boss/backdrop.asm
+BOSS_BD_TEXT	ends
+
+BOSS_BG_TEXT	segment	byte public 'CODE' use16
 	@SARA_BG_RENDER$QV procdesc pascal near
 	@LOUISE_BG_RENDER$QV procdesc pascal near
 	@ALICE_BG_RENDER$QV procdesc pascal near
@@ -2817,7 +2822,7 @@ include th04/main/boss/backdrop.asm
 	@YUMEKO_BG_RENDER$QV procdesc pascal near
 	@SHINKI_BG_RENDER$QV procdesc pascal near
 	@EXALICE_BG_RENDER$QV procdesc pascal near
-mai_TEXT	ends
+BOSS_BG_TEXT	ends
 
 main_TEXT	segment	word public 'CODE' use16