@echo off
for /f "delims=" %%a in ('dir /a-d/b *.txt') do call :r "%%a"
pause&exit
:r
setlocal enabledelayedexpansion
set n=1
for /f "tokens=1* delims=:" %%b in ('findstr /n "★.*★" "%~1"') do (
    if !n! geq 2 (
        >nul 2>&1 set /a "1/(%%b-line-1)"||(
            echo;del /f /q "%~1"
            goto :eof
        )
    )
    set "line=%%b"
    set /a n+=1
)
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powershell "dir . *.txt|?{((gc $_) -join \"`r`n\") -match '★.*★.*\n.*★.*★'}|del -whatif"
pause
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