Only after sending the Lightning Clone away did Sōkyū Hatake begin checking his mission rewards.
Yes, after Hiruzen Sarutobi handed Sōkyū Hatake his Konoha forehead protector, Sōkyū Hatake's system had notified him once that the mission was complete.
However, Sōkyū Hatake had still been in the Hokage Office at the time, so he had not checked what the system notification actually said.
After returning to the Hatake Clan Compound, Sōkyū Hatake finally remembered it.
``` [Ding!]
[Congratulations to the host on becoming a student at the Ninja Academy. Issuing a mission now!]
[Mission objective: graduate!]
[The host must graduate in more than six months but within one year!]
[Mission reward: Sage Mode!]
[Ding! Mission complete!]
[Mission reward! Sage Mode!]
[Mission reward issued! Host, please check!]
[Sage Mode: a state that allows the use of natural energy by absorbing a certain amount of it to create "senjutsu chakra." In this state, natural energy can enhance attack and defense, as well as increase the range of taijutsu attacks and perception. Combining natural energy with one's own chakra to create "senjutsu chakra" can dramatically increase the power of one's ninjutsu, taijutsu, and genjutsu, and can inflict damage on the Ten-Tails and its jinchūriki that is difficult to recover from.]
[PS: since the host completed the graduation mission within six months, a hidden Sage Mode reward has been granted!]
[Mission reward: Sage Mode (Advanced)]
[Sage Mode (Advanced): on the foundation of traditional Sage Mode, the host can designate any summoning beast for Sage Mode fusion, producing twice the effect of the original Sage Mode!]
[Follow-up mission: make a name on the battlefield!]
[Mission objective: kill the corresponding numbers of people before the war ends!
1. Kage-level fighters: 1!
2. Elite jōnin: 5!
3. Jōnin: 5!
4. Special jōnin: 5!
5. Elite chunin: 20!]
[Mission