Shounen ga Otona ni Natta Natsu, Episode 4 English Subbed

少年が大人になった夏 / Shounen ga Otona ni Natta Natsu

#4. ジャイロウ | Jairou | Gyro

Protagonist Kirishima Ryuki begins to question why his sister, Reiko, has kept her room off-limits for the past four years. Determined to uncover the truth, he opens the door to her room and is confronted with a revelation that changes everything. Reiko’s hidden nature is laid bare, and as Ryuki becomes entangled in her chaotic world, he finds himself drawn deeper into a cycle of forbidden pleasure and emotional turmoil. With their secret bond growing stronger, Ryuki realizes there’s no turning back as he steps further into adulthood, forever changed by the summer that defined him.