Saikyou Yakuza no Kokoro no Naka wa Igai to Yasashii

Akira Ryuuzaki is a maniacal yakuza that everyone fears! However, something strange happens, causing the inside of his mind to leak out to the people around him… but his mind is actually filled with tremendous kindness!? A heart-warming yakuza comedy where he makes everyone happy without his knowledge!

(Source: Square Enix, translated)