On Day 2, choose "Go to the pool" over "Stay home." At the pool, ignore the bikini girls. Walk to the lifeguard chair. Climb it. This unlocks the hidden "Lifeguard Makoto" subplot where you actually become useful. It raises everyone’s respect by +5, which is stupidly rare.
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Here is the part most guides won't tell you: On Day 2, choose "Go to the pool" over "Stay home