Haibara's Teenage New Game+

Natsuki Haibara reaches the end of university with a life that looks acceptable from the outside but feels empty to him. His high school years were wasted after a failed attempt to change himself, and the regret stays with him until he suddenly wakes up seven years in the past, just before entering high school again. He still has his memories, habits, and social lessons from college, but his body is back to the awkward boy who once lost his chance. Natsuki decides not to repeat the same quiet failure. He fixes his appearance, studies how to talk to people, and enters school with a plan to build the youth he once missed instead of drifting through it alone.

His second attempt begins with small choices that change everything. He reaches out to classmates, joins conversations before they close, and tries to form a group around people he admired from a distance in the old timeline. Hikari Hoshimiya, the girl he once liked, becomes someone he can actually speak to. Miori, Reita, Uta, Tatsuya, and others also enter his daily life as he works to protect the friendships he failed to make before. The problem is that memory does not give him full control. Old insecurities return when he is judged, and every success creates new pressure to keep his social place from collapsing. Natsuki uses knowledge from adulthood to avoid obvious mistakes, but he still has to live through exams, club choices, jealousy, misunderstandings, and first love in real time. His new youth is not a perfect route. It is a second chance that only works if he stops treating people like goals and starts meeting them honestly.