Sumire Seto- Ena Yuzuriha- Yua Hidaka - I-ll Gi... Direct

Note: You likely meant Iori instead of "I-ll Gi".

Iori is the titular character and the primary heroine of the series. She represents the "unattainable ideal" for the protagonist, Ichitaka. A classmate of Ichitaka, Iori is a beautiful, kind, and somewhat reserved girl who works as a model and actress.

The three actresses performed together in an underground theater piece titled “Watashi ga Ataeru” (I Shall Give) at the Shinjuku Loft Plus One in February 2023. The climactic line: “I’ll give you my silence.” Fans filmed snippets, and the hashtag #WatashiGaAtaeru trended for 24 hours.

Without specific details on the "I-ll Gi..." project, it's challenging to provide a comprehensive review. However, assuming these individuals are collectively involved in a musical or voice acting project: Sumire Seto- Ena Yuzuriha- Yua Hidaka - I-ll Gi...

Positives:

Negatives:

The likely answer: fragmented management. Sumire Seto is signed to a theater company that discourages excessive media exposure; Ena Yuzuriha refuses interviews and has no social media; Yua Hidaka’s band albums are self-released on Bandcamp. “I’ll Give…” may have been a one-off indie collaboration — beautiful but short-lived. Note: You likely meant Iori instead of "I-ll Gi"

Fans regularly petition for a reunion or full release. So far, no official announcement.

Note: Often grouped with the main trio, though not listed in your prompt, she is vital to the plot.

While not in your list, Itsuki is the catalyst for much of the story's early conflict. She is Ichitaka’s childhood friend who moves away and then returns during high school. Negatives: The likely answer: fragmented management

Given the information available, it seems that Sumire Seto, Ena Yuzuriha, and Yua Hidaka are involved in a project or series referred to as "I-ll Gi...". The voice acting industry in Japan is known for its collaborative and creative projects, often bringing together talented individuals for unique and engaging stories.

If you have more details on the project, such as the genre, the full title, or the nature of their involvement, it would be easier to provide a more detailed and accurate write-up.

Note: In the official series, the protagonist is Ichitaka Seto. There is no main heroine named Sumire Seto.

It appears there may be a confusion regarding the name "Sumire Seto."