Ren Furutachi is a supporting character in the romantic comedy anime series 'Koi to Yobu ni wa Kimochi Warui' (It's Disgusting to Call This Love). He is a close friend and classmate of the main character, Rio Amakusa, and often finds himself involved in Rio's outrageous antics and romantic pursuits. Ren is known for his laid-back personality and supportive nature, often providing a grounded perspective amidst the chaos. His friendship with Rio highlights the series' themes of love, friendship, and the challenges of growing up.