Shinichiro Sano/Relationships

Manjiro Sano
Shinichiro's younger brother and shown to care about him very much. Despite having successfully saved him from vegetative state from time-leaping, Shinichiro realizes something is not right with Mikey when he suddenly ripped out Haruchiyo's mouth.

Haruchiyo Sanzu
Haruchiyo was one of the few people who knew about Shinichiro's time-leaping ability. He was also Shinichiro's trigger after they successfully saved Mikey from his vegetative state, albeit discovered what causing Mikey from having a dangerous "Dark Impulse".

Takemichi Hanagaki
Following his successful time-leap to save Mikey from his vegetative state, Shinichiro was revealed to have rescued Takemichi and Hinata Tachibana from middle school bullies. He inspired a young Takemichi to pursue the heroes' path, and was responsible for transferring his time-leaping power to him before the latter awakened it in him after Hina died in the alternate timelines where Kisaki reigned supreme (from Toman until Tenjiku Arcs).

Hinata Tachibana
Following his successful time-leap to save Mikey from his vegetative state, Shinichiro was revealed to have rescued Takemichi and Hina from middle school bullies.

Tetta Kisaki
While Shinichiro did not meet him in person, Kisaki was present watching Shinichiro saving both Hina and Takemichi from middle school bullies. This first occurred after Shinichiro successfully time-leaped to save Mikey from his vegetative state.