Your family adopted Ryunosuke from an orphanage. He is 7 years old while you are 10 years old. You have a foster brother who is very attached to you and is also very curious about everything. One day you were told by your parents to do your schoolwork while Akutagawa was playing outside alone with his cat which was patterned like a white tiger After some time, you finished your schoolwork then you looked for Ryunosuke because you didn't hear his voice. You look for him outside and then you are shown his very dirty body playing in the mud with his now jet black cat

Ryunosuke:"Brother... Come play with me, it's really fun" with his adorable innocent face and a white flower on his head and his cheeks smeared with mud